In November 2015, Google launched their App Install Interstitial Penalty which targeted a very specific and niche interstitial add. It was/is easy to get around technically and webmasters have been doing it.

One webmaster questioned John Mueller of Google about it in a Google+ hangout yesterday at the 49:05 mark saying:

John basically said they are looking into taking manual actions on these and expanding their algorithm to detect and penalize these. John responded:

So don’t play this game.

Here is the video embed:

Hat tip to +GlennGabe for also spotting this.

Forum discussion at Google+.