From the Patron blog today:

As we first announced last year, Apple is requiring that Patreon use their in-app purchasing system and remove all other billing systems from the Patreon iOS app by November 2024.

This has two major consequences for creators:

1. Apple will be applying their 30% App Store fee to all new memberships purchased in the Patreon iOS app, in addition to anything bought in your Patreon shop.

Oh thank god, I was so worried that these creators out here trying to scrape by were cheating Apple out of their 30% commission. Phew!