Google is banning lock screen ads from the Play Store. In the new section on Google's developer monetization page, Google says: "Unless the exclusive purpose of the app is that of a lock screen, apps may not introduce ads or features that monetize the locked display of a device." Android Police reports: So, an app that bills itself as a photo editor, VPN, or file explorer cannot also cram a new lock screen on your device that's infested with ads. However, an app that is actually a lock screen can still monetize with ads. Presumably, you know what you're getting when you install a lock screen app. This policy change is long overdue. It's been a few years since these ads started showing up, and it's getting pretty out of hand.