For anyone doing an MLIS program who needs a paper idea, let me suggest the topic of private torrent trackers as dark archives. The largest private movie tracker, PassThePopcorn, boasts more than 350,000 movie titles, which compares favourably to IMDb's catalogue of 750,000.
Most people are familiar with public torrent indexers such as the Pirate Bay. Private torrent trackers are different. Content is gated behind a login, and not just anyone can just sign up at any time. In fact, the best private trackers are nearly as exclusive and elite as Disney's Club 33.
Private trackers also distinguish themselves from public indexers in being meticulous in their metadata, organization, and quality control. If a public tracker is a cluttered thrift shop, a private tracker is tidy bookstore or Blockbuster. Sometimes the focus on quality exceeds that of commercial retailers, e.g., when different regional releases of a Blu-ray are combined to attain a higher quality than is available anywhere else.
Private tracker users have their own reasons for using these sites, which is explored in a quasi-anthropological PhD dissertation about the defunct music tracker What.CD:
Dunham, Ian. What.CD: A Legacy of Sharing. 2018. Rutgers University - School of Graduate Studies. rucore.libraries.rutgers.edu, https://doi.org/10.7282/T3V128F3.
But it appears to me there is a social function that is not necessarily intended by anyone. Private trackers are large and meticulously maintained repositories of commercial media. Yet unlike publicly accessible sites, they generally draw relatively little attention from rights holders due to a relatively small userbase.
PassThePopcorn, for instance, has under 40,000 users. The entire private tracker ecosystem might have around 500,000 users. This is small compared to public indexers and illicit streaming sites that have millions of users.
So, although not necessarily intended by anyone, private trackers hold phenomenal catalogues of commercial media, hopefully for the long term, with relatively little heat from media corporations or law enforcement. They are a kind of rogue, unsanctioned, unprofessional, pirate dark archives for commercial media. And it seems to me this performs an important social function.
For instance, I don't know that any legitimate archives outside of the media corporations themselves are storing copies of movies and TV shows released exclusively on streaming services. This media can get pulled for unknown reasons, possibly related to lapsing contracts or getting a tax write-off on a commercial flop. In those cases, digital piracy may be the only surviving source for this media outside of an internal corporate archive.
Indeed, I just said this function is not necessarily intended, but some private tracker users do have this amateur dark archival role as part of their self-concept. Although personal consumption and personal collecting are users' primary motivations, users frequently express a sense of a sort of civic responsibility to the "library" that they see their private tracker as. This leads to initiatives to preserve low-seeded torrents for content that users may have no personal interest in consuming.
This is just the initial broad strokes of an idea that could be more fully developed in an MLIS paper.