KYC is “Know Your Customer” aka identity verification. Usually it would be something like a selfie of you holding your ID, proving you are the person on the card. If you think getting your identity stolen from one picture is bad, wait until you learn about social security numbers. It’s a 9 digit number based on publicly available information about you that is incredibly easy to figure out, and are used as like the defacto way of verifying your identity in the US, when that was never its intended purpose.