Well, this is news! I had not heard of this ban until I read it here. The day has certainly been eventful, so we will see how long this lasts. banning him sounds like censorship, although it's hard to argue that Twitter is the only way for the President to communicate, since his resources are so huge and he can call a press conference anytime he wishes and have the ability to talk diirectly to the American people.
It is a kind of censorship, but as private companies, it is their choice.
"under my roof..."
It is just one channel less, but it is ineffectual for the most part, as he has so many mouth pieces there still anyway.