You're required an ID card (in most country in europe, a digital id) to prove your are the owner of the bank account and in case of a procuration, you still have to prove you id and you need the procuration itself which contains reference of id card of the account owner and other details.

You could theorically withdraw money from an account by faking the procuration, providing you know the id details of the account owner, but you are still required to present your id card which contains a digital photo of you to prove you are who you pretent to be.

Fake id are maybe common in the us thanks to your broken SSN system but in europe, digital id cards are centralised from the moment you're registered as human being at your birth and banks have access to that system when they check your id.

Any attempts to withdraw money from your account leave a trace, and in case of fraud, you would be quickly with the cops on your trail.