I wonder, at point is Twitter supposed to block the user for constant spread of disinformation on its platform? Or would that violate the user's right to "free speech"? Could the user protect himself by claiming, that he is simply expressing "his own opinion"?
Free speech means the government can't come after you for statements. Anyone claiming a company is infringing on their free speech is at best ignorant of, and at worst purposefully misconstruing, the bill of rights. You have no right to post whatever you want on a private company's platform, they can ban you whenever and for whatever reason they want.