alt Hacker NewsCompanies can absolutely refuse a customer and many do. Companies will often have public rules about not doing business with weapons manufacturers or tobacco producers.
They also can refuse business due to political stance. They can even give different prices to different customers.
As long as its not a protected class, by the letter of the law you’re right, but we’re not discussing law: we’re discussing human response.
If you were kicked off of a VPN provider (or, even a site) for financially supporting a non-proscribed political organisation: how would you talk about it.