I think it’s just poor wording. It says they released tracks that were scraped from Spotify via BitTorrent. I think the punctuation and sentence structure is awkward. I think what they were trying to say was more along the lines of “they scraped millions of tracks from Spotify, and released them via BitTorrent.”
Still not technically correct, because you don’t release things via BitTorrent. But it at least clarifies that the songs were first scraped, and then released via torrent.