Anna’s Archive (“the largest truly open library in human history”) is backing up the entirety of Spotify. “We have archived around 86 million songs from Spotify. While this only represents 37% of songs, it represents around 99.6% of listens.” https://annas-archive.li/blog/backing-up-spotify.html
Backing up Spotify

We backed up Spotify (metadata and music files). It’s distributed in bulk torrents (~300TB). It’s the world’s first “preservation archive” for music which is fully open (meaning it can easily be mirrored by anyone with enough disk space), with 86 million music files, representing around 99.6% of listens.

@kottke How can you post this and use their term "backing up" without offering any counterpoint? It's obviously theft and surely massive lawsuits are coming their way.