I can think of more cases of Visa and PayPal cutting off payments (e.g. to alt-right media organizations, Backpage, gambling) than ISPs. It's of course their right not to process payments for whomever they want, and I personally haven't shed any tears over the organizations I've mentioned, but I do wonder whether it is a good thing that payments are so centralized they effectively become an extragovernmental regulator, especially because their motive is loss prevention and public image rather than public interest.