Yeah, that’s what it would be. I am old have visions of people poring over the data manually :)

Trackers can show which users are active in a torrent at a given time. They may indicate whether a user has a complete copy of a file or is still downloading it. If investigators followed newly posted torrents over a long period, they may have been able to identify an IP address that repeatedly appeared as the first source with a complete copy.

That’s some dedication