Google’s enforcement actions against shady Android apps and developers come at such a regular pace these days that it’s starting to be hard to keep track of all the bans and violators. There’s just so many — and today, Google added to the pile, with a major crackdown that includes kicking almost 600 apps out of the Play Store. Google hasn’t as of the time of this writing identified which specific apps were part of this enforcement, which seems largely to have focused on ad fraud, though Per Bjorke, Google’s senior product manager for ad traffic quality, has said the apps were mostly games and utilities. Unfortunately, this action comes after the apps had collectively garnered more than 4.5 billion installs. In a company blog post authored by Bjorke and published today, the apps were said to be banned for “violating our disruptive ads policy and disallowed interstitial policy .” The post goes on to note that Google defines disruptive ads as those which are displayed to users in unexpected ways — and which impair or interfere with “the usability of device functions.” They can occur in-app, but Google says one form of disruptive ads it’s seen on the rise are so-called out-of-context ads.