Let me know when you find them. So far, every “free-speech“ platform has been a dumpster fire full of instant bans for anyone the user base does not agree with.
4chan is interesting because it feels like a holdover from the "old" internet. Less a "platform" and more an unruly forum with its own distinct culture.
If 4chan had anywhere near the size/reach of Twitter or Facebook, I think it would either be more toxic or more restrictive in its moderation.