The application does not collect contact information like for example name and email addresses from the users. The only "personal" information the application might collect is device indentifiers and location related data like IP addresses.
This data is collected solely for the internal operations of the advertisement networks that this application uses.
Some reasons why advertisement networks collect this information are the following: a) for displaying user relevant ads, b)for performance tracking and ad frequency capping, c) for providing aggregate reports to publishers and advertisers.
In the links below you can find more detailed information on what data is collected and how this data is used.
Admob ads https://www.google.com/policies/technologies/ads/
Vungle ads https://vungle.com/privacy/