We can talk about the App store tax or other gross things Apple has done but to my knowledge Apple has never rug-pulled on something like payments. I can't think of a time they released something for free/lower fee then add/raised the fee. Maybe I'm forgetting something?
Also I think this is related to/create because of the DMA so they are opening it up because they have to, they aren't likely to try to close it down/add fees.