The best way to preserve the [more] endangered datasets is to use the RSS feeds. They have them split-out for various focuses like scarcity, source, threat level, etc. I went with the "all" feed and filtered in my download client.

Is this legit? Weird filenames on some of them.

Yes. I'm seeding about 30TB. I've dug into it and it's as advertised.

Is there a torrent file containing all of these torrent files?

More torrents are added, most days. That might preclude the a master torrent. That and the sheer size.

what's a good thing to run on a headless raspi for this?

Install the transmission-daemon and transmission-cli packages, and control the daemon with the transmission-remote command (from the latter package).

Rtorrent + rutorrent

Which one of those is pubmed?

It’s the one I’m most interested in but I couldn’t find it through the search function.

Whats the most important torrents? I could in theory download some, but i have limited space.

Which ones is worth seeding? Any interesting?

the sorting buttons on that table dont work

…what? I’d be keen to know what “verified torrents” pass your extensive checks. Literal Linux ISOs.