To play the devil’s advocate here: MEETS_STRONG_INTEGRITY on Android doesn’t require a Google account AFAIK. But it might change, of course.

Edit: but as pointed out elsewhere in the thread, Play Integrity is not the only way to do hardware attestation on Android. GrapheneOS devs have a guide: https://grapheneos.org/articles/attestation-compatibility-gu...

So avoiding proprietary Google stuff altogether is possible and we should encourage it.