You get a hive mind or you get regression to the mean, by which I mean you either aggressively filter for people with specific qualities, which is apparently a hive mind scenario, or you end up with the same kind of commentators you find on every other let-everyone-in platform.
https://hubski.com/
https://lobste.rs/
https://snapzu.com
https://soylentnews.org/
and Voat.
I don't really use them so I can't do a good review. I had some more bookmarked but can't find them at the moment.