You can read here the privacy policies of the Space BlackJack 2100 mobile application
The application Space BlackJack2100 stores no data, except your high score. No data stored is collected, or shared. It stays on your mobile device and goes nowhere else (except if you move it yourself). In case you want to delete your data, you can go to ‘Settings > Apps > Space BlackJack 2100 > Storage’ and delete your data there. The application doesn’t need other permissions.