I have the same issues explained here: https://www.vbulletin.com/forum/show...ealing-content
vBulletin can't really help. The site doesn't have a valid license but is hosted on dodgy hosting who don't seem to mind dodgy sites at all. A DMCA takedown just gets ignored.
Google complaints have been filed, along with Adsense complaints, but nothing seems to get done.
It seems they're ripping content via RSS feeds.
Anybody got any suggestions as to how to prevent this?