[sillystu04]

Visa/Mastercard can demand merchants meet certain standards of consumer care in order to participate in their networks.

No consumer business can operate without access to those card networks.

[arp242]

I really don't want unelected corporations with no accountability to anything other than profit margins to be policing payments, subscriptions, business behaviour, or anything else.

These companies provide an utility that is essential for participation in the economy. There needs to be some due process if you want to exclude people or corporations from that.