We've been talking back and forth with multiple regulators over the past several years about the Play Integrity API to have action taken against it. Unified Attestation is a massive disruption to our efforts and will get in the way of having regulators take action against this. We've also been considering filing a lawsuit against Google over the Play Integrity API.
Unlike Google, the companies involved in Unified Attestation don't have massive resources to defend their anti-competitive system.