Comment by Spivak

This is correct for one side of Apple's market but not the other. You're right that Apple doesn't have monopoly power on the consumer side because there are alternatives and if you cared a whole heck of a lot you could create your own. It's capital intensive sure but being expensive to enter a market and having a moat doesn't mean you have a monopoly. If all your friends hung out on Discord then you're gonna have to use Discord to talk to them, if all your friends play a Windows exclusive game then you're gonna need a PC to play with them, the green bubble thing is nonsense.

But Apple does wield real monopoly power on the other side of their market which is app developers. I don't think large developers have any real choice but to bite the bullet and take whatever terms Apple offers and be on iOS because that's where your users are. Developers aren't choosing Apple as the better product in the way consumers are.