Imagine if an user of a Visa credit card must be allowed to use the same magnetic stripe on the Mastercard network. Do you support that? How is Apple doing anything different?
Erm, the EU has pretty much already done that. Payment networks must support competitors running over their terminals and network for a fair price.
Go lookup up EuroPay, didn’t quite pan out how the EU expected. But if you wanna start a new payment network in the EU, MasterCard must help you out.
There’s no real opportunity for either MasterCard or Visa to rent seek in an effective manner. Compared to the US where interchange is sky high, despite slightly greater competition, the EU has a pretty good deal. Also regs like PSD2 further push/incentivise payment networks and banks to reduce fraud losses further, and thus reduce the costs that are ultimately borne by consumers and merchants.
If you think that a company is a monopoly/duopoly, that's an argument for forcing them to support more interoperability with competitors, not less.