As per the title, is there any template on this forum or an article I could reference, so that my request sounds more eloquent / persuasive to the app developer in question?
Contact app developer to explain why enforcing Play Integrity is wrong
I'm not aware of a message template, but there's this article from the official GrapheneOS website which also explains how developers can integrate the normal hardware attestation API as an alternative: https://grapheneos.org/articles/attestation-compatibility-guide
Both are helpful, thanks!