Should have stuck with NemID a previous paper alternative or only offered MitID as a digital alternative. The rush to go all digital is coming back to bite them in the .....
How would you use a paper ID online? (Securely, i.e. not the insane thing of taking a selfie holding it or something similarly bizarre in an age of powerful GenAI.)
One of the flaws of that system was exactly that you didn't know which domains where allowed to issue the requests for a one-time key.
Each service would serve the authenticator snippet from their own domain, with their own certificate. MitID, for all it's centralization flaws, solved that by only being valid under the mitid.dk domain. I doubt that most people check the domain and the certificate, but they could.