The whole "mirror fediverse" / "fun side of the fedi" is in fact quite amusing to watch, it's like a primordial soup of unmoderated hell threads with people competing hurl the most shocking insults at one another.

I think the ideologies which people are afraid of ("Nazis") require taking one's self seriously enough that they can't survive such a chaotic environment.

Recall Torba didn't rip federation out of Gab because the Left-fedi banned him, he ripped it out because @p mocked him incessantly, got the whole rest of the network doing it, and converted his users en-masse.

I think a lot of the fear about online extremism is less that people will become terrorists and more that a new culture of irreverence and doubt will emerge, undermining political leaders and their institutions.