When user don't have an internet connection i want to show a black fullscreen popup that include like

"you should open your internet to use this app"

or

"no internet connection found please open it"

every minutes for show my google ads; and popup will countdown from 5 second for close the popup.

And i don't want to be banned from google ads because of illegal behaviours.

Is it forbidden or illegal with google ads policy, i didn't see any information about this on google ads docs?