What's anti-competitive with what Apple does with iMessage? iMessage's lack of popularity everywhere else in the world is proof that competition is able to flourish. Apple is under no obligation to make an Android app, and it's silly to pretend not making an app for another platform is somehow anti-competetive.
The market simply chosing a preference is not anti-competive. iPhone and iMessage is able to compete on it's own merits without competition being artificially hindered.
The market simply chosing a preference is not anti-competive. iPhone and iMessage is able to compete on it's own merits without competition being artificially hindered.