Bittorrent over Tor is generally discouraged. It's _very_ easy to accidentally de-anonimize yourself, and while the Tor network benefits from people casually browsing the Web to provide anonimity for others, large amounts of Bittorrent traffic would strain the network. Especially with a >400 TiB and quickly growing collection
Seeding over Tor should work though. So although it's technically a public IP, it's also just a cut-out (from the uploaders perspective).