https://en.wikipedia.org/wiki/Shouting_fire_in_a_crowded_the....
The disturbing part about these bans is they seem to be done unilaterally if not coordinated by private for profit tech companies.
Drifting from the original comment here but: Consider this twitter and facebook unilaterally decided to ban the president of the united states... what message does that send to the other world leaders?. Last I checked nobody elected Zuckerberg and Dorsey.