I remember someone complaining they had to send Hetzner a passport or some other type of ID to cancel their services.

Does anyone know if that's still the case?

They require passport or some sort of ID on registration, and it is weird when compared to others. I was not happy with that part, but I am happy customer since (almost a decade now).

As far as I know, they do not require any ID when canceling the service.

Well I would appreciate that, since I was victim of russian hackers and they had access to all my servers and stuff on Hetzer, they even changed passwords and mail on Robot but i restored everything...