To put this into perspective, What.CD [0] was widely considered to be the music library of Alexandria, unparalleled in both its high quality standard and it's depth. What had in the ballpark of a few million torrents when it got raided and shut down. Anna's rip of Spotify includes roughly 186 million unique records. Granted, the tail end is a mixed bag of bot music and whatnot, but the scale is staggering.
[0] https://en.wikipedia.org/wiki/What.CD