i use it to share pictures from my NAS to my phone. And play video from it.
Also, in Belgium, it's completely legal to rip and share ( within family circle ) copyrighted content.
This is an unusual (and risky) choice for most people, since BitTorrent is designed for swarm distribution, and ISPs generally don't look kindly on subscribers seeding torrents on their networks. I think it's safe to say that 99.99% of people use options like DLNA/UPnP, Plex, Jellyfin, or simple SMB/NFS shares for personal media sharing.