Not very many use cases??

Except for: - updates of software. - distribution of public video files. - distribution of install images. - distribution of raw public measurements (ea science data).

Basically BitTorrent is the protocol for any usecase with 1:n (or n:n) with public data (ea. No data access controle is needed).

Copyright has nothing to do with it and the nature of BitTorrent does make it also a good fit for some pirates.

Never forget that the following is shared over BitTorrent: - World of Warcraft updates. - Linux distribution install images. - haveibeenpowned sha lists.

And that’s just what I personally know. I know there is more.