Sorry to say this but FUCK ITCHIO!
Nah, fuck payment processors. They're providing an, at this point, critical service and are proving they shouldn't have that power.
Itch is an *insanely* small company in comparison who'd just be swept aside if they didn't comply.
There is a petition on change.org - "Tell MasterCard, Visa & Activist Groups: Stop Controlling What We Can Watch, Read, or Play” with over 230k signatures.
https://chng.it/TKNgYpmvzW