Regional App Availability and ModJoy: A Guide for Older Android Devices

https://apkpatcharena.rivetgarden.com/posts/modjoy-and-apk-parse-errors-common-mistakes-android-users-make

Older Android devices can still be useful, but they often need more care with app versions and resource use. Regional app availability can vary because developers, stores, services, licensing, language, or local rules differ by country