Yet their demands are almost entirely about limiting restrictions imposed by Google Play. There is a paragraph about not doing anticompetitive shit like banning partners from installing other stores (antitrust by settlement, what a world), but nearly all of the rest of the document is about making sure they don't need to pay with Google's payment processor or that the rates are lowered to a decent percentage.

> Yet their demands are almost entirely about limiting restrictions imposed by Google Play.

Because most people only ever use the Google Play store. Epic can invest all the effort they want into their own store, but that won't help if the audience is elsewhere. You are basically making the "just build your own Twitter/Facebook" argument - it's about the audience, not the technology.