No, I don't think that would hold up in court.
But again, I don't t think you understand the point I'm trying to make.
I'm saying that Twitter does have a right to ban people, but that they can't use this right whenever they feel like it, precisely because they have become so big that blocking someone does come down to silencing them. Twitter must show that there is an objective reason. If it is argued that Trump was banned, because they feared he'd incite violence and they have several tweets that show those fears are grounded, I'm sure Twitter's reasoning would hold up in court. But I definitely do understand why Twitter was so cautious and only banned him now.