Case in point it's super easy for me to find discogs of even unusual artists I grew up with on torrent sites. But if I search for artists mentioned a lot in the indie music press today I really struggle to find anything on the torrent sites.
I don't trust corporations to look after their own cultural artefacts. Karagarga is a beautiful example, passionate individuals will mash together video from one movie release, audio from another and subtitles from another to create a competent release of a film because no perfect copy exists. They'll do it purely for their love of the source material.
This is what happened to a lot of the songs by amateur musicians on mp3.com when it shut down in 2001, and that was all downloadable. I still have a few songs I downloaded from mp3.com that I have not seen hosted anywhere else. For streaming this has been an ongoing problem with SoundCloud for a long time. A lot of musicians delete their accounts or get blocked, move on with their life, and there is not a download option so all that is left are "check out this cool track" dead links.
This is ironic when you consider that a lot of mp3 blogs of the 2008-2011 era were about "rediscovering" amateur cassette and little known vinyl releases from the 1970s and 1980s.