I wonder how hosting a torrent is different to google showing a link to a pirated movie, both are just holding data that tells you where to find the content, not the content itself
I think Google is expected to abide DMCA takedowns in such cases, but IANAL. My understanding is that even an indirect reference (such as a link or infohash) is a DMCA violation.
They happily link to a prime number that will decrypt DVDs in blatant disregard for the DMCA, however. I don't believe they received a takedown request for this one.