UK Passes Digital Markets Bill to Curb Big Tech Power

Parliament has passed the Digital Markets, Competition and Consumers Act, handing UK regulators sweeping new powers to curb anti-competitive behaviour by the world's largest technology platforms — marking the most significant overhaul of British competition law in a generation. The legislation, which cleared its final parliamentary hurdle after months of intense lobbying from Silicon Valley, establishes a formal regime for designating the most powerful tech companies as having "strategic market status" and subjects them to binding codes of conduct enforced by the Competition and Markets Authority.

What the Act Does and How It Works

The Digital Markets, Competition and Consumers Act creates a tiered regulatory framework centred on a new legal concept: Strategic Market Status, or SMS. Companies designated with SMS are those that the CMA determines hold a "position of strategic significance" in a digital activity — essentially, platforms so dominant that their conduct shapes the competitive landscape for entire industries. Designation is not automatic; the CMA must conduct an investigation lasting up to nine months before a company receives SMS status.

Once designated, a firm becomes subject to bespoke conduct requirements set by the CMA, which can include obligations to share data with rivals, allow third-party app stores on their platforms, or refrain from practices that privilege their own services over competitors. The CMA can also impose pro-competition interventions — structural or behavioural remedies — without waiting for a full market investigation, a significant acceleration of enforcement powers compared to the previous regime.

The SMS Designation Process

To receive SMS designation, a company must have a UK turnover exceeding £1 billion or global turnover above £25 billion, and must hold a "position of strategic significance" in at least one digital activity. The CMA will examine whether the firm acts as a gateway between businesses and consumers, whether it enjoys substantial and entrenched market power, and whether its activities have a significant footprint in the UK. Designations last for five years, after which they must be renewed. Industry analysts have noted the threshold is calibrated to capture only the largest platforms — primarily Alphabet, Apple, Amazon, Meta, and Microsoft — rather than creating a broad regulatory burden across the technology sector. (Source: Competition and Markets Authority)

Conduct Requirements and Enforcement

Once a company holds SMS status, the CMA has wide latitude to set tailored conduct requirements addressing specific harms identified in a given market. These can range from interoperability mandates — requiring a platform to allow its services to work seamlessly with rivals — to data access obligations that give smaller competitors visibility into the behavioural signals that dominant platforms currently exploit exclusively. Fines for non-compliance can reach 10% of global annual turnover, a figure that, for a company the size of Alphabet, would represent tens of billions of dollars. The Act also grants the CMA the power to seek court orders requiring immediate interim compliance where it suspects ongoing harm, officials said.

Context: Why the Legislation Was Needed

British competition law, as it stood before the Act, was designed for an industrial economy. The existing framework required regulators to prove harm retrospectively — a process that typically took years and often concluded after markets had already tipped irreversibly in favour of a dominant player. The digital economy, characterised by network effects, data advantages, and winner-takes-most dynamics, proved poorly suited to this model.

The CMA's own market studies into online platforms and digital advertising, published over successive years, documented in extensive detail how Google's dominance in search advertising and Apple's control of the iOS App Store created structural disadvantages for competing businesses. Wired reported that the CMA's investigation into Apple's App Store practices found the company extracting commissions of up to 30% from developers, with no effective competitive alternative available to iOS users. MIT Technology Review has separately documented how the self-preferencing practices of large platforms — promoting their own products and services in search results and app recommendations — have systematically disadvantaged independent rivals.

International Regulatory Alignment

The UK Act arrives in parallel with major regulatory movements in other jurisdictions. The European Union's Digital Markets Act, which entered into force and began full enforcement recently, designates large platforms as "gatekeepers" and imposes similar interoperability and data-sharing obligations. The US has seen repeated congressional attempts to pass equivalent legislation, though none have yet cleared both chambers. The UK government has been careful to position its approach as distinct from the EU model — arguing that the CMA's bespoke, evidence-based conduct requirements offer greater flexibility than the EU's more prescriptive rule-based system. (Source: European Commission)

This legislative momentum reflects a broader global reassessment of how competition law applies to digital markets, a debate closely tracked by those following the UK's evolving approach to tech giant regulation across multiple fronts simultaneously.

Industry Reaction and Corporate Lobbying

Technology companies mounted sustained and well-resourced opposition to the legislation during its parliamentary passage. Apple argued that sideloading requirements — forcing it to allow app installation from sources outside its App Store — would undermine user security. Google contended that data-sharing mandates could expose user privacy. Amazon raised concerns about the breadth of the CMA's investigatory powers.

Despite these objections, the Act passed with cross-party support. Ministers argued that the consumer benefits of increased competition — lower prices, greater choice, and more innovation — outweighed the compliance burdens imposed on companies generating hundreds of billions in annual revenue. The trajectory of the bill, which faced significant industry pressure during its passage, was closely monitored by observers tracking the Digital Markets Bill's journey through its final parliamentary vote.

Small Business and Developer Perspectives

Not all industry voices opposed the legislation. Trade bodies representing app developers, digital publishers, and smaller technology companies broadly welcomed the Act, arguing that the existing environment had made it functionally impossible to compete with entrenched platforms. The Federation of Small Businesses described the legislation as long overdue, noting that small digital businesses frequently depend on platforms that simultaneously compete with them — a dynamic that places them at structural disadvantage. Independent app developers have documented in submissions to the CMA how Apple's and Google's dual roles as app store operators and app developers creates inherent conflicts of interest that harm third-party creators. (Source: Federation of Small Businesses)

Implications for Artificial Intelligence Markets

The Act's passage carries significant implications beyond its immediate targets of search, app stores, and digital advertising. As artificial intelligence products become increasingly embedded in consumer and enterprise technology, the potential for dominant platforms to extend their market power into AI-driven services has become a central regulatory concern. The CMA has already signalled that AI foundation model markets — the large-scale AI systems that underpin products like ChatGPT and Google Gemini — will fall within scope of its scrutiny under the new framework.

This intersects directly with the government's tougher AI safety rules for tech giants, which have been developed in parallel with the digital markets framework. Regulators are increasingly treating competition policy and AI safety not as separate domains but as interconnected challenges — a recognition that market concentration in AI infrastructure could amplify the risks that safety frameworks are designed to address.

Cloud and AI Infrastructure Concerns

The Act's interoperability provisions are particularly relevant to cloud computing markets, where Amazon Web Services, Microsoft Azure, and Google Cloud collectively account for the large majority of enterprise cloud spending in the UK. The CMA has raised concerns about switching costs — the technical and financial barriers that make it difficult for businesses to move their data and workloads between cloud providers — and about practices such as egress fees that effectively lock customers into a single provider's ecosystem. Under the new regime, conduct requirements could mandate that SMS-designated cloud providers facilitate easier data portability and interoperability with rival platforms. (Source: Competition and Markets Authority)

(Source: Competition and Markets Authority; Gartner; IDC estimates)

Consumer Protections and Broader Reforms

Beyond the digital markets provisions, the Act also delivers substantial reforms to consumer protection law. It grants the CMA direct enforcement powers against companies that breach consumer rights — previously, the regulator had to seek court orders before it could act. Businesses found to have used unfair commercial practices, including misleading subscription terms or deceptive pricing, can now face fines directly from the CMA without the delays associated with litigation.

Fake online reviews — a persistent problem documented by consumer groups and trading standards bodies — are explicitly addressed, with new provisions making it a criminal offence to commission or publish fraudulent reviews. The Act also introduces stronger protections around subscription contracts, requiring companies to provide clearer pre-contractual information and easier cancellation mechanisms. These provisions are expected to affect a wide range of digital services from streaming platforms to software-as-a-service providers. (Source: Department for Business and Trade)

Enforcement Timeline and CMA Capacity

Regulators and policy observers have raised legitimate questions about the CMA's capacity to enforce the new regime effectively. The authority has been significantly expanded in recent years, but industry bodies have noted that the complexity of investigating conduct across multi-sided digital platforms — where the same technical action can simultaneously affect advertisers, publishers, developers, and consumers — demands substantial technical expertise. The government has indicated that the CMA will receive additional funding to support digital markets enforcement, though the precise allocation had not been fully detailed at the time of the Act's passage, officials said. The broader direction of UK digital governance, including how this Act fits alongside other measures, is increasingly relevant to those monitoring the UK's AI regulation framework ahead of international summits.

What Comes Next

The Act's passage marks a beginning rather than a conclusion. The CMA must now operationalise the SMS designation process, publish guidance on how conduct requirements will be developed and enforced, and make decisions — expected over the coming months — on which companies to investigate first for potential designation. Market participants and legal advisers expect Google and Apple to be among the earliest subjects of SMS investigations, given the depth of prior CMA work on their respective markets.

Parliamentary scrutiny of digital regulation is unlikely to diminish. Legislators across party lines have indicated continued interest in how the Act performs in practice, particularly whether the nine-month designation timeline proves workable and whether conduct requirements are sufficiently robust to drive genuine market change. Those following the interplay between digital market rules and online content governance will find relevant context in coverage of how tech giants have previously challenged UK digital rules — a pattern that is expected to continue under the new regime.

The Act represents the UK's clearest statement yet that the regulatory frameworks inherited from the analogue economy are insufficient for the realities of platform capitalism. Whether it delivers on that ambition will depend on the CMA's willingness to act decisively, the robustness of its investigative capacity, and the courts' interpretation of its new powers when — as is widely anticipated — the largest technology companies mount legal challenges to their designation or to the conduct requirements imposed upon them.