Hulu, Fox, TNT etc have a huge incentive to find out how adblocks work and how to stop them. In comparison YouTube has a similarly huge incentive to stop adblocks, but to the adblocks themselves YouTube and adsense are the largest producers of the ads that their customers see. So adblockers specifically target YouTubes method of delivering ads, and all Hulu has to do to play ads is not play them like YouTube.
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