I haven't used private trackers in a long time, but I was looking for FLAC files and started thinking about it more. Mainly I'd be interested in music, comics/manga, and retro games.
Flacs. Use like telegram bots. That's easier. Other comment said rutracker, that is neat too. As far as manga goes you can find em different sites but like use tachiyomi to download. If that's not fine, then you cantry like nyaa I guess.
Sorry I don't have any info private trackers.
rutracker has a lot of good album rips and some artist discography torrents. It's actually only semi-private. Anyone can register for an account and you need one to use the API to search though you can use yandex with site:rutracker[dot]org set and search for what you want that way without one.
You could always interview for RED as well. You need to do prep and there's a site for that, educate yourself extensively but it's not at all impossible to get into if you want.
That's just music though. While rutracker has some games they don't focus on retro games, you'd need a more specialized site I think for that. Same with comics/manga.
Here are some links, sorry that they're from reddit:
https://old.reddit.com/r/trackers/wiki/getting_into_private_trackers https://old.reddit.com/r/trackers/comments/6c5dn6/rtrackers_faq_v3/
And of course see the megathread which might help you find what you need in public spaces: https://rentry.co/megathread
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