Loss of popular 2FA tool puts security-minded GrapheneOS in a paradox
Briefly

Play Integrity cannot verify whether custom Android OS subverts the security model, leading to app incompatibility and access issues for users.
Custom ROMs like GrapheneOS lack Google Play Services by default, creating challenges for apps that require validation through Play Integrity.
Efforts to establish trust between high-quality ROM makers and Google for future compatibility involve legal complexities and significant work on both sides.
Read at Ars Technica
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