It's highly unlikely that a regulator would cap Apple's cut at e.g. 10% like that. Apple is using a monopoly on distribution to enforce a monopoly on payments (

It's highly unlikely that a regulator would cap Apple's cut at e.g. 10% like that. Apple is using a monopoly on distribution to enforce a monopoly on payments (and can thus monopolistically set prices arbitrarily) so it is most likely a regulator would force them to allow competition on distribution and payments, and thus allow the market to change the 30% organically, rather than just enforce a different arbitrary cut.