If you want to object against the use of this data for advertising purposes, you can deactivate personalized advertising in the app setting under Privacy and in your device settings. On an apple device this can be done in the iOS preferences, under "Privacy" -- "Ads" and enabling the option "no ad tracking"; for a user owning an Android this can be achieved by opening the "Google Settings" (or first "Settings" and then "Google"), clicking on "Display" and ticking the option "Disable personalised ads. You can reset the IDFA or the Advertising ID at any time with these options.
AdMob is an advertising service provided by AdMob Google Inc. Please read this overview of how they use information from sites or apps that use their services.
Personal Data collected: Unique device identifiers for advertising. For example, Google Advertiser ID or Apple ID For Advertising.
For our app, we use Crashlytics (Crashlytics, 1 Kendall Square, Cambridge, MA 02139, United States) for analysis Of Systemcrashs to improve the stability of our app. This analysis program uses the IP addresses of the User for analysis purposes. These are anonymous and therefore a conclusion can not be drawn to a concrete person become. For more information, please visit: https://try.crashlytics.com/terms/