That's not how the US presently works -- see things like the ADA or discrimination laws, which regulate how a business may deny service and what accommodations

That's not how the US presently works -- see things like the ADA or discrimination laws, which regulate how a business may deny service and what accommodations for customers they must provide. It's not absurd that an essential civil service -- payment processing -- should be regulated to uphold our collective standards of freedom, and not use their privileged position to impose their private moral standards on society.