Despite what the competition wants you to believe, the Google Play Store really isn’t an open playground for app developers to do as they please. In fact, to better combat developers who try and game the system by “manipulating ranking or relevancy” of their apps, Google has made a small amendment to their Android developer guidelines.
Under “Keyword spam,” app developers are no longer permitted to provide direct quotes or testimonials from “happy” customers. While this may sounds harmless on the surface, more than a few developers have been using this as a way to add special keywords to their listings so that their apps appear higher in search rankings. A big no-no in Google’s book.
For an example of exactly what Google is referring to, make sure to check out the “Description includes unrelated keywords or references” section of their Google Play Developer Help page here.