It's an odd omission that the "feminist server" mentioned is actually a gathering place for TERFs, after they were banned from places like Reddit. If your community is problematic enough to be kicked off of Reddit, I can imagine your users/content may not be desirable to Meta/Threads' brand, either.
The banned subreddits are archived here, they weren't particularly problematic, but the 'TERF' viewpoints they expressed angered the people-of-gender in the Reddit admin team so much that they decided to ban the whole lot: https://www.itsafetish.org/archives/gendercritical
It's unfortunate because there was often a lot of interesting and thought-provoking discussion there that hasn't quite been replicated on its successor, Ovarit.
Meh tbh reddit bans everyone now, it's not the place it once was where if you're banned on reddit you have to be particularly bad. People have been banned for liking a president, it's not like that's some fringe ideology. Banning feminists for thinking feminism is for females is pretty heavy handed.
