For Reddit there's http://communities.win. That's where all the subreddits that got cancelled went. Reddit refugees, used to a finally manicured echo chamber, will of course find it toxic. It doesn't suffer from the problem of Gab and Truth social in that there's enough fun stuff mixed in to make it funny and reasonably entertainin and not just excessively doomer politics.

Rumble seems to be doing pretty well too. Nothing can replace Reddit for the unbelievable variety and ontology of adult content though.