If they're saying that authors have no control over what's posted, then they might well already be in violation of the DMCA safe harbor clauses.
Bob, as a note, if you do send the DMCA request and they don't respond, or worse, blow raspberries, you can always send the request to their ISP, and a complaint to Google in terms of "this site you advertise on has refused to remove my copyrighted material". Google's ad business, like most of their business, is under a lot of pressure from the copyright cartel, and if YouTube advertising is any indication (video game reviews with footage are specifically called out as a no-no, that's how strict it is there), they'll pull advertising in a hurry if there's an indication that copyright violations are earning someone money somewhere.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
Bob, as a note, if you do send the DMCA request and they don't respond, or worse, blow raspberries, you can always send the request to their ISP, and a complaint to Google in terms of "this site you advertise on has refused to remove my copyrighted material". Google's ad business, like most of their business, is under a lot of pressure from the copyright cartel, and if YouTube advertising is any indication (video game reviews with footage are specifically called out as a no-no, that's how strict it is there), they'll pull advertising in a hurry if there's an indication that copyright violations are earning someone money somewhere.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor