This article is from 2014.  A few things have changed since then.  For example, Google now does offer ads in the Play Store:  <a href="http:&#x2F;&#x2F;adwords.blogspot.com&#x2F;2015&#x2F;07&#x2F;launching-search-ads-on-play.html" rel="nofollow">http:&#x2F;&#x2F;adwords.blogspot.com&#x2F;2015&#x2F;07&#x2F;launching-search-ads-on-...</a>