https://techcrunch.com/2019/08/16/android-users-tricked-adware-apps/

Dozens of Android adware apps disguised as photo editing apps and games have been caught serving ads that would take over users’ screens as part of a fraudulent money-making scheme.

Security firm Trend Micro said it found 85 individual apps downloaded more than eight million times from the Google Play — all of which have since been removed from the app store.