> ... noting that ownership "does not always mean absolute dominion." The court pointed out that the more an owner opens his property up to the public in general, the more his rights are circumscribed by the statutory and constitutional rights of those who are invited in.
https://en.wikipedia.org/wiki/Marsh_v._Alabama
Twitter is going to be forced to unban most if not all people if they want to be a general open to the public social network.