Indeed, Parler banned lots of speech. Especially breasts.

Case in point, alt-left communities who champion "free speech" like Hacker News often shadowban people who express opinions they disagree with, especially if it's said in the wrong 'tone' of voice--direct aggression rather than passive aggressiveness, which is the preferred atmosphere here.

I was honestly more so thinking about holocaust denial which some consider to abhorrent but others within the line of acceptability.

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.