as soon as they see the massive bandwidth draw ..... they will remove it.
Ickie, Bittorrent is a peer-to-peer technology. There host site only lets people download a small (10 to 20K typically) file and hosts a tracker that lets people uploading/downloading find each other's IPs. The bandwidth all comes from from people downloading, since as soon as a chunk is downloaded, it's shared with other downloaders.
Henry, yep, some idiot uploaded some movies, looks like, and they haven't gotten around to purging them. The terms of use of that site prevent illegal stuff, but it appears the hosts haven't pulled those yet.
There are other legal torrent hosts, such as legaltorrents.com, that others could consider for hosting. What it boils down to is that, if someone puts up a torrent, people can have this file in hours instead of days/weeks, legally, and the bandwidth all comes from people who are downloading, rather than the host site.
S-O could even host its own torrent tracker for large files. As long as the moderators approve any torrent files before they're posted, the same protection against illegal software would be there as with regular downloads. If you did this for all larger files, it could cut S-O's bandwidth costs significantly.