Google updated its policy for developers of applications online Play store. First appeared such as a ban on adult content and themes in children-oriented applications, such applications will be deleted immediately.
Also the ban of the app, promoting violence and inciting hatred against individuals or groups on racial or any other characteristic associated with systemic discrimination or marginalization.
Another very interesting change was the ban on the miners. Yes, Google announced a ban on mining cryptocurrencies on Android devices. At least, such applications are now banned in the Google Play Store. However, while in the app store there are many miners, including MinerGate, Crypto Miner and NeoNeonMiner.