Some hackers or other bad aliens analyzed my apk file and can extract files (fonts, images) inside.
How can I block this?
You can’t block it.
you cant, you can make it harder for people to get code by using il2cpp, but that just adds a other step for them to crack, and assets in your build can all easily be taken.
So if user download unity made apk file from google store, where it is installed in the phone? I want to see its file structure.
Probably in Application.persistantDataPath… Look up where that exactly is in your device and check that folder out.
Most will just use one of the popular file explorers (astro, es file explorer, etc.) and backup the application in the app and copy that apk over to their pc.
It’s a fairly fruitless endeavor to try and prevent this. IL2CPP is easy and probably a good middle ground. You could also try to obfuscate things if you’re using mono. Most cases it’s a waste of time to try and slow people down.