But what should be is not the same as what is.

While my personal opinion of the FSU's founder is so negative as to be unrepeatable in polite society, I regard certain categories of business (loosely speaking "infrastructure", but the boundary is vague even in my head) as being the kind of thing that must be available to everyone by default and only allowed to reject customers/users in very limited and well defined cases (think "court order" not "T&C says we can do it for any reason").

I regard the larger payment provision services, PayPal included, to be infrastructure.

There is certainly a right to discuss the social impact of a business’s practices.

And complain about unfair denial of services.