The first move that will come out of this will be a Meta store for "all your meta products". You won't have the choice of Instagram on the App store or Instagram on the Meta store, you'll have Instagram on the Meta store.

This won't be a choice for users, this will be a choice for large developers.

That never happened on Android, why would it be different on iPhone?

So just follow your own supposed ethos and don't use Meta products?