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There might be a way to fight them through this, if you claim that the poster didn't have the right to grant them the license:
6. Proprietary Rights/Grant of Exclusive Rights
By posting information or content to any public area of POTENTIALPREDATORS.COM, you automatically grant, and you represent and warrant that you have the right to grant, to POTENTIALPREDATORS.COM an irrevocable, perpetual, fully-paid, worldwide exclusive license to use, copy, perform, display and distribute such information and content and to prepare derivative works of, or incorporate into other works, such information and content, and to grant and authorize sublicenses of the foregoing.