@noticias@masto.rocks @rek2 quite a handful of active and spam-free newsgroups to join; most, if not all of them, is tech-related though (either on alt.* or on comp.*).

There are other private servers to join though. See for example tildeverse's at news.tilde.club. I've recently begun to self-host my private NNTP server at retrobsd.ddns.net (port 119). Everyone is welcome to join the discussion.