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Basically the Pornhub site (and its ilk) are "loss leaders" insofar as they're designed to be free advertisements, whereas the NFL games are "the valuable product itself". Unless and until the porn sites have to worry that failing to block access via VPN's will cost them (financially or criminally) they wouldn't have any obvious motivation to do so, since it is extra expense and headache for them. That would be my guess 
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