Since it’s admob my guess is it’s Google analytics. Which means everything you look at or touch, but it’s probably as much for the developer so they can see how users are reacting to the app layout and designs.
The developer should move to an open source platform for analytics if this bothers users.
GA can only collect what you specifically give it (clicks, touches, hovers...etc), so the developer should be able to be very specific here. Using GA by default only collects very basic impression info.