Doesn't matter what users care about, what matters is: "Is Apple abusing their position in the market?" One could claim since Apple IS the iOS market, for them

Doesn't matter what users care about, what matters is: "Is Apple abusing their position in the market?" One could claim since Apple IS the iOS market, for them to disallow competitors in certain app categories but not others, they are indeed abusing their position as a market owner, especially since they are the only one allowed (by them) to develop a browser engine.