Yes but they have the ability to shut down accounts with no grace period or recourse.

A rare case where one-sidedness goes both ways. Except I'm guessing a business owner will lose more sleep over an account termination than Stripe execs will because somebody criticized their service.

They choose not to call out lying. That could be the right choice! Of course if they do call it out they could be sued for slander/libel, but that isn't the same as "not allowed".