The Play Store NEVER shows ads in the notification tray. EVER. They actually just made that a 'no-no' for apps in there, too. However, before the new ToS, apps were allowed to use ad-push networks, so the culprit is most likely a dodgy, free app you installed. Just install an ad-network detector and see which app is pushing those pesky ads and you're set. I recommend LookOut's tool: https://forums.androidcentral.com/e...ails?id=com.lookout.addetector&token=XN2-MR6z