They're not the government. They've no obligation to platform anyone at all, whatever sort of extremist they are. Get used to it, examine why the world will be a better place, move on.
That's just objectively false we have a long history of forcing companies to take customers from Utilities, Americans with Disabilities Act, anti trust laws, forcing companies to license technology, and a whole bunch of other ones when needed; This is no different.
We are talking about it because we find the current state with Visa and MasterCard as unacceptable.