Proof of identity is not fine because the identity is an issue-once static identifier. It is the weakest link in any security scheme because the general population cannot roll it over. Once it is exposed, it is exposed forever, so it's a liability to the user, not an asset.

Imagine you cannot change your password.

optimism

megaptera

Proof of identity is fine but they require proof of address and this will be very bad and doesn't accept you mention you live with your parents and proof with name of your parents as proof of address like students having +18 years old. Common issue for multiple stupid KYC sites.