Yes, they are private companies but it seems they got together and decided to take this action collectively in response to the desire of elected officials.
Yep, kinda seems like collusion...
This is different than if a company just decided to ban someone because they violated site policy.
no it isnt, fortunately. Business have an absolute right to make those decisions and we as customers have the right to complain and take our business elsewhere. The political right owns talk radio... should radio stations be forced to give air time to left leaning hosts, even if the shows are unpopular and dont make money? I say no way. If Twitter and fb become unfriendly to so called conservative or right leaning voices then those users will leave. Thats freedom my friend. I would never trade it.