It is from the banks that leveraged their KYC but was adopted very broadly by gov and many other id required or linked services. AFAIK it does not need a computer to activate besides your phone and one of those bank issued 2FA challange card readers.

For CSAM, also AFAIK, first 'activation' includes a visit to your local municipality to verify your identity. Unless you go via itsme, as it is and authorized CSAM key holder.