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> “Requiring someone to host another person’s speech is often a perfectly legitimate thing for the Government to do.” So wrote Justice Breyer, and the cases he cited (PruneYard and Rumsfeld), as well as Turner, fully support that view. PruneYard expressly rejected the claim “that a private property owner has a First Amendment right not to be forced by the State to use his property as a forum for the speech of others.” Turner and Rumsfeld rejected similar claims.
It may be wrong but it sure feels good to post a cartoon as a snarky response rather than having a reasoned discussion.
Essentially, Trump agreed that they had the right to ban him before he posted anything to their services.
So sure, the government may be able to force people to host things they don't want to, but I don't think the government will force anybody to break a contract that both parties agreed to in this case.