What is interesting, according to google play policy, every app must complain this policy, not only new publications, old active publications must complain this policy. So developers should stop this ads or undo publications or make update. Why Google Play when they update policy at first remove a lot of app, but NOW it is legal? Developers do not know what to do, because notification ads give higher revenue. In addition when most of developers do not use notification ads, but these developers who using notification ads have higher revenue.