@vollaficationist @GrapheneOS as the brand that focuses the most towards user privacy and security, it makes sense for GrapheneOS to not support something like this which is basically Google but European with its own user surveillance stuff (even if they say, they don't we will just have to trust them blindly like we do with Apple products and consistently there have been proofs that /e/ does communicate with Google and OpenAI servers for stuff that Graphene and Calyx could already without connecting to them, so it's false marketing in a way).
While I do think having an alternative to Play Integrity API is good and it's better than nothing but hardware attestation is the best way to do it. And Volla & Murena doing something that gives them total control instead of pushing something focused towards privacy like hardware attestation shows that there have some ulterior motives. And with EU also pushing for surveillance like Chat Control and backdoors, I'm not sure this is a good idea.