I tried to sign up for a private account with Hetzner some 4 or 5 years ago, and they requested a scanned copy of my ID card or passport to proceed. I can understand it as they get legally entangled in any eventual abuse that may occur on their systems, but also, I can't understand it. Additionally, scanning and digitally sharing personal identification documents is illegal in some European countries under anti-forgery laws concerning important documents and banknotes etc.