See: Milo Yiannopoulos. Arguably he became a lot less prominent after he got banned. It is easy to be exposed to tweets and ideas by someone you don’t follow, yet not necessarily the rebuttals of those ideas.
Milo became less prominent after he got banned, but not necessarily /because/ he got banned. His loss of prominence followed an impressive string of self destruction, of which his banning from twitter was only one part.