Definitely not peak, my kid asked for a Rubik's Cube solver app which turned out to be subscription based, then wanted to tune her Ukelele with an app which turned out to be subscription based.
One of my favorite games ever, and I'd gladly pay for an ad-free version, but they don't have it. I assume there's much more money to be made with ads, over subscriptions.
I think a few bucks for ad-free brings in more money for most developers, but that still pales in comparison to a recurring subscription model (or models where people keep spending in-app on consumables).
Gameboy emulators are now available again in the iOS app store or even as a a web app. Or just play on real hardware.
Once governments force Apple to allow sideloading we should get some kind of f-droid for ios which only lists open source user respecting apps.