The Danish MitID identity "service" is actually pretty clever, except for the app used to approve actions or requests on your behalf. It's designed in a way that ensure that it can verify your age, but reveal nothing else about you. It isn't going to be used for "Porn ID" though. Instead it will provide your age information, basically 15+ or 18+ (I think those are the options), to an identity wallet, which in term will validate your age to the porn sites. Unlike the UK version there's no reason to have your face scanned, because the Danish government already knows your age and can provide that information via a trusted channel, MitID.

That's probably the issue the other post aludes to. The identity wallet will only be available via Google Play or the Apple App Store (as far as we know). So without a phone and a Google or Apple account, you're won't be able to provide your age information to e.g. PornHub.

Exactly this. Except the new service is not released as part of MitID but as part of the new digital wallet app (den digitale tegnebog). This is a separate and "voluntary" app which is meant to be offered as a convenience. Except it isn't really voluntary when the app is introduced together with new regulation that requires you to verify your age in places where you were previously anonymous, and the only way to actually stay anonymous and retain access is via the app.