GrapheneOS actually explicitly pushes for services to switch away from Play Integrity API or SafetyNet API towards the Android Attestation API for that reason.
https://grapheneos.org/articles/attestation-compatibility-gu...
And notably, long term if Google becomes an unreliable maintainer for Android, the other major Android providers are likely to coordinate a list of "approved signing keys" so that apps can use those with the standard Android HW Attestation API.
That's what Google has been strongly pushing to developers.