"We will need you to send us a high quality scan of a government ID or passport in order to verify your account. Please send the picture, or a link of the picture, to:" No thanks.
Unfortunately we deal with a large amount of abusive and fraudulent signups which leads to a bunch of abuse on the network such as mining, port scanning, and flooding. We do everything we can to filter out abuse automatically and then determine whether or not a customer is legitimate outside of that but unfortunately that information isn't always available or conclusive. We'd love to hear suggestion on how we can imp…
Barring that, detect mining and terminate it with system monitoring tools, and prevent port scanning/flooding at your network border (your netops team is active on NANOG and seem to know what they're doing).