Interestingly, Patreon doesn't give creators an option of "Just don't accept donations for us from Apple users" instead, which is what my old project (SQLite Browser / DB Browser for SQLite) would have gone with if available. :(

I've instead handed the reins to others, so I don't have skin in this game any more. ;)

Apple generally frowns upon things like that. At one point they wouldn't even let you disclose in your UI that Apple was taking a 30% cut of transactions, it was against the rules to do so.