Has anyone ever brought up the idea for some type of flagging system on the hub entries? Something like what youtube has for its videos.
Just a simple drop down with a few choices of possible reasons to flag that hub: misleading text, inappropriate content, ripping, spam, etc.
Then once a hub has a certain amount of flags/points the staff can investigate the issue to see if there's any merit to the flagging.
Limit the flags to 1 per Key and/or IP and have a system where you could raise/lower the points that a certain person's flags are worth if you see them continually making sensible/bogus calls.