A competitor can pause his ad and then generate thousands of fraudulent impressions on the keywords causing competitors' CTR to crash. This will raise the price for competitors and/or kick their ad offline by disabling their keyword (no clicks in last 1000 impressions).
This is what I think has happened to me and others in the last days, with a competitor's ad disappearing during the night, impressions going up to 40000 from the usual 2500 daily, and to 12000 from the usual 200 daily, all competitors (including me) experiencing a fall in their level of interest (CTR) to the point of being kicked off. The competitor appears back online the following morning with full green bar. When putting back the ads, I get very low level of interest (from full bar before the fraud took place). In any case, this competitor can in any moment pause his ad, generate thousand of fraudulent impressions and drop my CTR or even kick my ad offline.
I have informed Google about this, but still no reply.
Would be interested to know if any of you have experienced this before or know of any similar case,
Thanks