The Bright Yellow Giraffe app doesn't collect user data, and as such, no user data will be stored or used in any way because it doesn't exist.
The Google Play Store and Apple App Store may collect certain information automatically, including, but not limited to, the type of mobile device you use, your mobile devices unique device ID, the IP address of your mobile device, and your mobile operating system.
Users cannot in any way interact or exchange information, the app is not able to share personal information with third parties, nor is it able to share any user's physical location with other users.