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They actually have a page to report click fraud on your own account: https://support.google.com/adsense/bin/request.py?&contact_type=invalid_clicks_contact htt

• mistercow 15y ago
  >Please keep in mind that it's your responsibility to prevent invalid activity from occurring in your account, and this form does not absolve you of that responsibility. Perfect. So it's your responsibility to prevent invalid clicks, even though pretty much any way you can think of to prevent them is explicitly forbidden by the TOS, but if someone does click your ads a bunch of times, let us know so we can steal all the money you've earned in the last month and shut you down.