The point I’m making is that the argument “Well they built it, shouldn’t they benefit” would make sense if these regulations posed any sort of existential threa

The point I’m making is that the argument “Well they built it, shouldn’t they benefit” would make sense if these regulations posed any sort of existential threat to their success. But Apple is already so entrenched that regulation like this won’t. The “doing something you right” you speak of is apple making a great product, and they can make a great product without their monopolistic practices. Furthermore, I don’t think these regulations apply to new/non-entrenched players either, so I don’t think they will stifle innovation.