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I added a site to my AdSense competitive filter this morning only to see the ads still displaying a few hours later.
On closer inspection, the URL the ad was going to wasn't the display URL, but was in fact going via clickserve.uk.dartsearch.net part of the DoubleClick network.
This means the only way to stop the ads showing would be to ad dartsearch.net to my competitive filter, which may result in legitimate ads being blocked.
Are clickserve/Doubleclick allowed to do this, if so, is there a way of blocking individual ads?
As it stands it makes a mockery of the AdSense competitive filter system
But even if it does, it makes the AdSense competitive ad filter pointless. I blocked the site it should have landed on, but it has
no effect on the ad, as it must be going via a redirect.
If everyone starts doing this, i.e redirecting through another URL to the destination page it will make the AdSense cometitive filter
If I understand you correctly, the competitive filter does not work like the above sample?
But regardless, there's no reason to believe that Doubleclick has to follow the same TOS as regular AdWords advertisers do. And no, I don't believe there is any way to block individual ads anymore than I can block some ads from ebay and target and not others.
All an Adwords publisher has to do is set the ads like this
example.tld >> redirect.tld >> example.tld
it complies to guidelines because example.tld is the display URL
and the landing URL, but overrides the competitive ads system
because of the redirect.