Steve Troughton-Smith on Mastodon:

If Apple isn’t stopped, there will come a point where Apple slaps a 30% tax on all VISA transactions made on iOS (unless you use Apple Pay, of course!)

It could happen. Related, I’d love the option to use Apple Pay in iOS apps instead of in-app purchase. Apple would still skim off their small fee as part of the card transaction, but it wouldn’t hit developer revenue.