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Sure it is. Just figure out what IP the advertiser is checking from (if they have time to check at all) and show the ad to only that IP. The slot can then be sold repeatedly.

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That's trivially negated by services which constantly monitor the website from thousands of residential IPs all around the world.

Until you negotiate for the next cycle and the ad buyer realizes nobody clicked the link

Lots of people clicked the link, it's just that they were all people with botted machines.

The company could still tell from there being a 0% conversion rate.

Maybe their landing page just sucked.

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