It's not a monopoly, it's a vertically integrated business that is using its cash and marketing to lure in and lock in more developers, who in turn end up being working as unpaid labor for them, increasing the value of their app store, and the virtuous cycle continues. Noone else had pulled that before, apple could do it because phones peaked usability-wise and ended up becoming a fashion item. As long as developers keep being on apple's train, she calls the shots. There is no way to win this game, only to bail.