No I don't, but I get the feeling that you missed an assumption in the middle which is that Apple/iOS is a monopoly.

It's clear to me Patreon is not forced into having an iOS app. They do so because they think they can make more money. But they could be web only.

All of these entities already have a presence on Android + desktop/web and can operate just fine on those. They just want to make more money from the iOS audience.