I have released a game that can only be used in Korea on Google Play.
But at some point, there was a huge log-in in other countries like China.
Many hacking sites in China were hacking apps and taking advertising revenue.
What can I do to prevent logging in or using in these unwanted areas or hacked apps?
https://community.playfab.com/questions/14386/displayed-player-country-is-wrong.html
As I looked here, I thought I shouldn't block users with country code.
What we're trying to do right now is...
Update new build to Google Play with new version code (built in c# code).
Put the current allowed version code of the app(built in c# code) in the title data.
When logging in, we check if the version is different.
If the version is different, they are not allowed to play.
Use Scheduled Tasks to periodically delete players which have CountryCode=cn.
By doing so, I could not let Google Play external apps user play games for about a week.