Here are a couple of examples The Church of Wifi distributes rainbow tables for penetration testing, which I think is a legitimate use case. On the other hand if you recall when lulzsec was doing their thing they released a large list of compromised passwords, while not legal the data wasn't released with a restricted license per say. Also what if you can't find the origins or a license for the data in the torrent, then what?
I guess it comes down to legality. Rainbow tables aren't illegal per se, so as long as they are released as open data, everything should be fine.
Also what if you can't find the origins or a license for the data in the torrent, then what?
Then it's probably not open data and not really relevant for Open Data SE. Even worse, the data could have been obtained illegally, which is definitely not what we're going for here.