According to this report, a less than flattering press release from the MPAA seriously pissed off Google. You know, we were wondering how long Google would put up with those guys. I guess now we know. 

After delivering a major blow to torrent sites during October, Google must've thought the MPAA would be pleased. Instead, however, the MPAA issued a 'snarky' press release. According to a leaked email, the press release so infuriated Google's top brass that the company ended cooperation with the MPAA.