FWIW Apple explicitly doesn't support attestation for consumer apple-IDs. Only for managed apple IDs. Exactly because they didn't like the implications of forcing authentication to pre-approved implementations.
You mean they don't support third party attestation for consumer apple-IDs. Between parts pairing and the degree they've locked they're app store down, Apple is the king of things that refuse to be useful unless they're running in an approved environment.
They're just ensuring that their right to mistreat users is an exclusive one. Handcuffs are handcuffs, even if Apple is the only one who has the key.
