If you’re leveraging your large user base and market share in smartphones (or their OS) to muscle your way in to consumer payments (the ones that take place millions of times every day in economies such as the EU), competition, competition authorities and ultimately regulators will take notice.
Consumer and card payments are heavily (and quite successfully) regulated in the EU. Card payments are already in the process of being replaced by their virtual counterparts on consumer’s smartphones. Physical cards are probably going to merely act fallback payment devices in the foreseeable future.
What Apple is doing with Apple Pay, is muscling their way in between card issuers, schemes, consumers and merchants, to charge (albeit a very small) share of every card payment transaction that iPhone-owning consumers are going to make at merchants, physical retail stores and service establishments.