1. Third-party app stores fail here; if very few people download from them, they fail. They need to make money.
2. Developers are not going to cut their prices. Devs almost always make more money on iOS than on Android.
Oh yes. Some developers offer different pricing. Taking PortonVPN, one yes subscription on Android is $74.88, whereas iOS is $99.
This is just one example.
Clearly, by just offering different way of paying, I save $24 dollars for exactly samething.