Is Google Dropping AdSense Sites Using AdWords?

A discussion over at WebmasterWorld suggests Google may be dropping AdSense accounts from sites that buy traffic from AdWords.

Funny how this may have been the way to stop arbitrage way back before all the other methods were used and the experimentation cost regular advertisers lots of money through all the minimum bid increases.

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A photograph of an advert for Google Voice on the London Underground, at the station Gloucester Road. The poster spells out the stop name as it's pronounced, "glos-tuh rode", and underneath reads, "Say it to get it. Google voice search for mobile".
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Google I O 2016 on Google
A graphic showing the old Google logo superimposed over a faint search results page.