If someone install my app from play store then share the apk with other by sharing tools. In this case, will the admob ads show on other’s non play store installed app? Note that I didn’t approved the app with admob approval system.
Short answer, NO.
So I need to approve my app to work properly on every device?
Sideload APK = needs approval.
Install from Play Store = no approval needed.
A small suggestion if possible would be to check if the current app’s package name is on the play store, and if yes the ads would show even without approval, if installed from the APK.
EDIT: I already see how this would get abused…