I think we are dealing with multiple issues in regards to Donald Trump and his twitter account. The first issue is that he has to break the terms of service in a very clear fashion that twitter can defend their position to ban him without fail. The second issue is that he is United States President and whether we want to accept it or not, that comes with a certain level of power over business. Personally, even if you banned his twitter account, he would just start using Facebook or YouTube to get out his crazy messages.