This article gives a good walkthrough of sharing data with a widget using UserDefaults and App Groups: medium.com/better-programming/sharing-object-data-between-an-ios-app-and-its-widget-a0a1af499c31

There's an article on Medium now that walks you through the survey from the point of view of an AdMob user, you can find it by searching for "Filling out the App Privacy Section in App Store Connect for AdMob Users". Although I have to agree with @Pete, the new requirements make AdMob significantly less attractive as a revenue source.