The Chinese government issued a regulation requiring paid apps to have an International Standard Book Number (ISBN), prompting Apple to remove up to 46,000 apps, of which 39,000 were game apps.
However, the Chinese government regulation through this ISBN does not apply to free apps, so some popular games like Game for Peace (Chinese version of PUBG) and Call of Duty: Mobile, Honor of Kings may still circulate. on the App Store. .
Apple itself has warned application and game developers regarding this ISBN regulation since February 2020. Therefore, many application and game developers have changed their application system so that they can play for free.