Make it "Apple has 100% market share in unlicensable mobile operating systems".

Doesn't change the fact that it has 100% market share in that market, no matter how you call that market.

You can't have your cake and eat it too: you can't defend the ECs case on Android and not demand the same on iOS.

Well, you can, but then we're not talking about antitrust policy, we're talking about politics and picking winners.