It seems that Google follows the policy of Apple: preventing its app store abuses. The company announced that it is going to focus on preventing fraudulant reviews (source: http://venturebeat.com/2016/11/29/googl ... p-reviews/). It is extremely important as users are able to browse by reviews in Google Play.
This is a great step by Google. Many people would just give bad reviews to other apps so that they can list their apps higher. This is certainly very unfair and shouldn't happen. We believe Google has only done justice to Android Users as well as those who list their apps in Play Store.