No they don't - if it gets into the news that Twitter bans Trump for abusive behaviour, that will look super positive to the majority of people IMHO. I'd certainly put Twitter in a much brighter light.
When you take a stand for something - you might break some bridges - but you'll also be building bridges.
A significant portion of the American public would be outraged and would be screaming about censorship. Others would be elated.
It would be pretty interesting to see what the response would be, because Trump would no longer have an easy, low-effort medium to get his message out. Would he just turn to a right-wing social network like Gab? Would he just use traditional media instead?
When you take a stand for something - you might break some bridges - but you'll also be building bridges.