See the IGN watermark? They have every right to be asking the uploader to remove it. Nevertheless, it was a dumb move by IGN, should have just directly reported the video for copyright rather than make a public comment about it.
Regardless of the watermark, IGN's a little late to the party. Even if one gets taken down there's still gonna be more channels uploading the same trailer every time.
Bottom line, IGN is whining over a pointless issue. Just let the fans enjoy their trailers.