The Google Play Protect detection service, which scans Android apps for malicious activity, is enabled on more than 2 billion devices and detected 60.3 percent of Potentially Harmful Apps (PHAs) in 2017 using machine learning, according to Google’s Android Security 2017 Year in Review report. Google removed over 700,000 apps for violating its policies last year. While Play Protect uses a variety of tactics, machine learning is highly effective for catching PHAs, detecting things like inappropriate content, impersonation, and malware.

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