As long as this is in Google's hands, they can abuse it to control the market.
That said, Play Integrity accepting GrapheneOS would be a step forward, but they will never do it, because then other vendors might also want to pass attestation without preloading Google apps.
This is also a horrible idea. If an OS can be vetoed for untimely security updates, it can also be vetoed for not having something like clientside scanning.
What would even be the criteria for approval? Pinky promise to not let the end user have full control of their own device? That’s all “integrity” really means in practice. Don’t be fooled by appeals to security.
> Most of the thread seems to be a call for attestation to die, which feels impractical and unachievable.
I disagree, and I expect GrapheneOS devs do, too. Hardware attestation is a new thing, that isn't even really here yet. It absolutely can and should meet its demise.