This application does not collect contact information like for example name and email addresses from the users. The application also does not collect location data as location based ad targetting is disabled.
The only "personal" information this application might use is advertising identifiers for optimizing the performance of the ad network this application uses.
This is collected solely for the needs of the internal operations of the ad network. Some examples of specific reasons why advertisement networks might use ad indentifiers are the following: a) for displaying user relevant ads, b) for performance tracking, c) ad frequency capping.
Admob ads https://www.google.com/policies/technologies/ads/