In 2017 Google removed 700,000 rogue apps from Google Play for violating marketplace policies. Over 100,000 bad developers were removed from the Google marketplace. Google also said it booted 70 percent more rogue apps in 2017 than in 2016. 99 percent of apps with abusive contents were singled out and rejected before a user could install them, Google said. Many of Google s security gains are attributed to a series of initiatives rolled out over the past year.
Source: https://threatpost.com/google-booted-700000-bad-apps-from-its-marketplace-in-2017/129717/