https://thenextweb.com/google/2019/09/20/vpn-apps-with-millions-of-installs-caught-serving-disruptive-ads-to-android-users/

Google Play Store has a malware problem. And it doesn’t seem to go away despite the company’s best efforts to rein in sketchy apps.

In a yet another instance of Android adware, New Zealand-based independent security researcher Andy Michael found four Android VPN apps with cumulative downloads of over 500 million that not only serve ads while running the background, but are also placed outside the apps, including the home screen.