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Google plans to begin verifying the identity of all developers who distribute apps on Android, even if it's outside the Play Store, starting September 2026
(android-developers.googleblog.com)
Custom ROMs are in trouble on their own (seems to me Google is engaging in a multi-pronged attack on personal software choice), and some people can't install a custom ROM.
GrapheneOS says Google's recent changes will not stop them and it's nothing to worry about.