I want make app for children in Designed for Families category of Google Play. According to this: https://support.google.com/googleplay/android-developer/answer/6184502 there are two rules:
Ad walls must not be used
Interstitial ads must not display immediately upon app launch
I used to use this Interstitial: https://developers.google.com/mobile-ads-sdk/docs/admob/android/interstitial and it shows full screen. Or I wrong understood requarements?
Interstitial are full screen ads from which a user can quit.
Ad walls are data collection screens, and the most obnoxious don't even let you quit.
See this for a clear and simple overview.