I've heard GNU Social is doing quite well at the moment too. Probably cause quite a few internet communities have been encouraging people to use GNU Social instances instead of Twitter.
It has the same issue Voat does: the people I want to avoid went there.
Isn't that a good thing though ? More choices, more people will self segregate out.
The people I tend to agree with are just as prone to group think as conservative-leaning people. Hate grows in the absence of disagreement, and it doesn't stop at the echo chamber's walls.
So what do you actually want from a community then ?
It seems like you don't want certain people in it, but at the same time you do want them in it. I'm not sure if I'm understanding it correctly.
I'm assuming he doesn't want a community with only people he doesn't like nor a community with only people he likes. So he wouldn't move to a service where all the people he dislikes moved.