Apple doesn't attestation as part of their DRM (afaik) because it wouldn't be very useful. An iOS jailbreak requires the kind of exploits that would break attestation anyway, so it adds little value.

Movie studios could require strong hardware attestation for playback, but in doing so they would limit the set of compatible devices. They are in fact a little merciful (if only because they care about their bottom line).

> It's because they think it'd be illegal to lock you out over it.

I wish.