Google Keyword blog: Shielding you from Potentially Harmful Applications

Sometimes, Verify Apps will remove an application without requiring you to confirm the removal. This is an action we’ll take very rarely, but if a PHA is purely harmful, has no possible benefit to users, or is impossible for you to remove on your own, we’ll zap it automatically. Ongoing protection from Verify Apps has ensured that in 2015, over 99 percent of all Android devices were free of known PHAs.