DMA is shifting product constraints
Europe’s Digital Markets Act is moving beyond theory and is starting to reshape platform design by prioritising interoperability and contestability rather than only punishing behaviour. That shift means entitlement models, APIs and product defaults will increasingly be treated as regulatory design questions for engineering teams (politico.eu).
Europe wrote the Digital Markets Act to stop giant platforms from acting like private toll roads. In April 2026, European Commission vice president Teresa Ribera said the law is now starting to change how those platforms are built, not just how they are punished after the fact. (politico.eu) The key word in the law is “gatekeeper.” On September 6, 2023, the European Commission designated Alphabet, Amazon, Apple, ByteDance, Meta, and Microsoft as gatekeepers because they control core services like app stores, search, messaging, and operating systems. (digital-markets-act.ec.europa.eu) The law’s target is not only price or speech. The Commission says the Digital Markets Act is supposed to make digital markets “fairer and more contestable,” which is Brussels language for making it easier for rivals to reach users without asking the incumbent platform for permission. (digital-markets-act.ec.europa.eu) That sounds abstract until it hits product design. A phone operating system decides who can pair with a smartwatch, a messaging app decides who can send a message across networks, and an app store decides whether a developer can point users to a cheaper payment page. (ec.europa.eu) The first year of enforcement looked like classic antitrust. On March 25, 2024, the Commission opened non-compliance investigations into Alphabet, Apple, and Meta over Google Search self-preferencing, Apple App Store steering rules and browser choice screens, and Meta’s “pay or consent” model. (ec.europa.eu) Then the law started moving from courtroom logic to engineering logic. On March 19, 2025, the Commission adopted two specification decisions telling Apple what measures it had to take so third-party devices and app developers could interoperate more deeply with iPhone and iPad features. (digital-markets-act.ec.europa.eu) That is the shift. Brussels is no longer only saying “don’t abuse dominance”; it is increasingly saying “here is how access, permissions, and interfaces must work if the market is going to stay open.” (ec.europa.eu) Messaging shows the same pattern. Article 7 of the Digital Markets Act requires designated messaging services to make core functions interoperable on request, and in November 2025 Meta said WhatsApp users in Europe could opt into “third-party chats” with outside services including BirdyChat and Haiket. (europarl.europa.eu) (about.fb.com) Once rules reach that level, engineering teams inherit policy decisions. An entitlement is no longer just a software permission, an application programming interface is no longer just a developer tool, and a default setting is no longer just a user-experience choice; each one can become evidence of whether a market is open or closed. (politico.eu) (digital-markets-act.ec.europa.eu) The next checkpoint is close. Article 53 requires the Commission’s first review report by May 3, 2026, so the argument in Brussels is already moving from whether the Digital Markets Act exists to which product bottlenecks it should tackle next, including newer services tied to artificial intelligence. (goodwinlaw.com) (twobirds.com)
