From:
Google AdSense Program Policies
Traffic Sources
Google ads may not be placed on pages receiving traffic from certain sources. For example, publishers may not participate in paid-to-click programs, send unwanted emails or
display ads as the result of the action of any software application.
I italisized the part where I think applies to pop-under Ads since these Ads are launched by a software application that the website visitor did not want to launch IMO.
My forum signature is under construction.
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