This really isn't about Authy specifically.

It's about a possible trend of Apps refusing to run without Play Protect (which GOS can't provide) since it's not a signed Google OS.

It's a worrisome trend, but I don't think it will kill GOS because plenty of apps want to run on Chinese phones which cannot have Play Protect.

Play Integrity, formerly SafetyNet Attestation, essentially allows apps to verify whether an Android device has provided permissions beyond Google's intended models or has been rooted. Root access is not appealing to the makers of some apps involving banking, payments, competitive games, and copyrighted media.]

The last paragraph of the article has a bad link, going to reddit and not the GOS page they said they would link... it should be https://grapheneos.org/articles/attestation-compatibility-guide

The more I think about this, the more upset I become, this is removing user agency. Requiring verified hardware and software environments to run code has benefits, especially around security, but if someone wants to do banking from their VM they should be able to. The hardware should only empower user agency, never remove it.