From Apple
5. 3 Legal: Gambling, Gaming, and Lotteries
Guideline 5.3.4 - Legal - Gaming, Gambling, and Lotteries
Your app offers skill-based gaming, which is not legal in all of the locations where your app is available.
Next Steps
To resolve this issue, please revise your app to:
Restrict the locations where your app can be used
Resources
For information on location awareness options, please review the Location and Maps Programming Guide, available in the iOS Developer Center.
If you are interested in implementing geo-blocking, please review Monitoring Shape-Based Regions.
For information on how to edit the App Stores your app is available in, please review the Availability, pricing, and territory rights section of App Store Connect Help.