Case in point, alt-right communities who champion “free speech” like Parler and in Reddit often ban people who express opinions they disagree with.
It is a problem of all mankind, not any particular political color; the only color above it are of course specifically the free speech advocates.
As in, the things that, some wish, were banned by law.
I don't think many of the reddit moderators so notorious for wanting an echo chamber would advocate it be criminally illegal.