Some multimillionaire VP at Apple has decided that the best thing for the company, one of the biggest in the world, to do is introduce a new 30% tax on struggling artists and creators who have no business or professional relationship with it in the first place
Something I haven't heard much about is that Patreon, being a multi-sided marketplace, has a more complex/diverse creator-monetization model that wouldn't fully translate to Apple IAP.
2 noteworthy examples are: Per Creation Payments and Milestone Goals.
In this video Patreon's CEO explains it: https://www.youtube.com/watch?v=L-LoTH3PzgM