The Patreon website is equally shitty, at least it was when I last used it last year. Haven't tried the app though. So you hands should remain toasty.
But I do agree, why not just send Apple a big "fuck you" and create a really good mobile website?
Apple is still really pushing it with the 30%. I do agree that they should get cut, or straight up charge app developers a yearly fee for being in the App Store (which they already do with the developer licens), perhaps a smaller fee per update and a fee for using their subscriptions feature (which I do like as a consumer).
Patreon need to tread really carefully, because what Apple does not that different from Patreons own business model. Creators are similarly complaining about Patreons fees.
Still 30% is a lot, but I don't know what the actual cost of running the App Store is.
Considering its tendency to overheat your phone even when displaying pure text posts, it's there so you can warm your hands in winter.