Understand, though you may have misunderstood - none of the data is actually ON Yahoo anymore - Yahoo deleted all the groups at the end of 2020, and removed access to the data earlier that year. Before that happened, though, a bunch of volunteers worked to save what we could - over 960,000 groups' worth, of which probably a third is fandom - and it's actually all on my hdds (and someone else's as well so it's not lost). The trouble is it came in a disorganized mess and we don't even know what we have, much less have it so that we can upload, say, all the HP groups in one block, and all the Pokemon groups in another block, etc. So the project involves people using Google Sheets to read group descriptions and "tag" them with the appropriate fandoms and related tags (it helps to have people who know the fandoms well, you see, though a lot can be done by much googling), and those tags will be loaded back into a database and used to help me sort the data out so that it *can* get uploaded by fandom blocks. But that is time-consuming and not for everyone.

I'll definitely get to it at some point! I've only now been watching through Law & Order and enjoying it, but I'm taking my own sweet time as I don't spend much time watching anything these days (and L&O has A Lot to watch with how long it's run! even longer if one counts SVU which I've got my eye on as well). I do love cop type shows, though - I adore Rookie Blue, Rizzoli & Isles, Women's Murder Club, Sue Thomas F.B.Eye, C-16: FBI, Rejseholdet, am way behind on FBI and FBI: Most Wanted but I love those as well… so it's firmly planted on my to-watch list, probably as soon as I get through L&O. :) Thanks for the further rec!