Google advertisers blacklisted after exploiting AdSense, driving down CPCs

Google has confirmed they have blacklisted some ad buyers after they exploited their ad system, which resulted in AdSense publishers noticing declines in their CPCs over the past few days. Google has addressed the issue by blacklisting those ad buyers and identified the issue going forward.
If you saw your AdSense CPCs decline starting on Sunday, August 5, you are not alone. Google sent Search Engine Land a statement:
Over the past 48 hours, a number of AdSense publishers alerted us to an issue with declining cost-per-click for ads on their sites. We were able to identify the issue and resolve it quickly: Several ad buyers were using irresponsible campaign parameters, lowering query coverage for specific creative types in some countries. The ad buyers responsible have been blacklisted and impacted publishers should see that their coverage is back to normal in their AdSense account.
It seems that these ad buyers were able to manipulate Google’s ad auction platform which resulted

Search Engine Land Source

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