[bogwog]

> you are swapping Google Android for GrapheneOS Android

No? You're adding support for Graphene's keys, not replacing Google's. Obviously, the main barrier is convincing developers of these apps to add support for Graphene's keys. However, this is only a problem for apps that opted to implement the Play Integrity API at all, which doesn't seem to be very common. All the recent monopoly rulings against Google may be deterring devs from implementing this obviously anti-competitive feature, and that's not to mention Google's new responsibility to offer the Play store app catalog to competing stores, thanks to the Epic case.

> The injunction issued last year by U.S. District Judge James Donato requires Google to allow users to download rival app stores within its Play store and make Play's app catalog available to competitors. Those provisions do not take effect until July 2026.

(source: https://www.reuters.com/sustainability/boards-policy-regulat...)

Maybe they'll get away with requiring competing stores to implement Play Integrity API, maybe (probably) not.

Also, that list of incompatible apps is probably out of date since I use the ebay app all the time with no issues.

[pabs3]

My point was that this situation doesn't allow for Software Freedom, since you the user cannot control the OS, its an unmodifiable blob unless you are either someone with a blessed key (like Google, or GrapheneOS devs), or are willing and able to to go without the apps that use the attestation APIs, or have one locked down device for attestation apps and a separate one that you can actually control. Probably the only way to deal with that is make attestation to third parties illegal, I assume governments and banks would get exempted from such laws though.

[NoGravitas]

Android has a hardware attestation API that is compatible with GrapheneOS (if the app accepts GOS's keys), but nobody uses it. Everyone uses the Play Integrity API; GrapheneOS can't pass the "strong" (hardware-backed) level of Play Integrity, though it passes the weaker ones.

[thomasdeleeuw]

The Dutch electronic identification app, DigiD, uses the Android-native attestation API.

Also good to make a distinction between the different things you can do in an attestation procedure: bootloader/boot integrity checks, attest a specific key, and ID (imei etc) attestation.