Apple has banned all of those from iOS. It allows no third party app stores.
> Remember, the market is mobile devices altogether, not just iOS devices.
You cannot just tack on the word "remember" to make something an established fact. We don't know what the scope of future legal decisions will be until they're in fact made.
> Which will not happen, because you can't have a monopoly on your own platform.
You, nor I, have any way of knowing or proving that. This will likely go to SCOTUS in our lifetime, until that happens we won't know the scope of what is a monopolistic market.