You'd be amazed at the effort that goes into curation and comprehensiveness on a good private tracker. Because ratios are so important there is a strong incenti

You'd be amazed at the effort that goes into curation and comprehensiveness on a good private tracker. Because ratios are so important there is a strong incentive to upload obscure stuff that is missing. Additionally, the ratio economy can be tweaked for things like providing subtitles (including translations where there have been none before). There's a private film tracker that I'm aware of where I believe half of the members must be film studies professors. They will post monthly themes on obscure genres such as "queer cinema prior to 1950" or "Italien cinema under Mussolini" and these will literally include hundreds of films. It's so impressive that I think some of these private trackers could reasonably argue in court that they are engaging in fair use for academic study. It's archival work at a scale that would be unimaginable if restricted to recognized institutions.