Twitter, Reddit, and Facebook ban people all the time for calls to violence. Reddit made the national news last year because moderators of r/The_Donald failed to police the numerous posts of users who plotted to murder the governor of Michigan.

Parler, by contrast, did not moderate calls to violence. It quickly became a safe space for neo-fascists to plan, coordinate, and execute plots against the US government.

Parler was playing a completely different game to Twitter, Reddit, and FB. Parler was deservedly ejected from the stadium.