If we want to subject payment processors—or social media—to the common carrier standard, then obviously, they can’t deny services to anyone who isn’t violating the law. Having politics Visa, Mastercard, or Stripe doesn’t like isn’t illegal.

The point I’m making is that I don’t think it’s hypocritical to suggest that such a standard applies to some companies, not all companies, which is what your original post seemed to suggest. I’d personally want to set the bar pretty high when it comes to taking away any business’s right to choose their own customers.