Probably a boring answer but I know my grandmother’s credit card information. I live with and help take care of her, so she doesn’t mind sharing it with me. Not like I’m planning to do anything nefarious, but I guess technically it could ruin her financially.
My Internet help desk days are over 20 years behind me, but that’s the default user/password combination for some consumer routers. D-Links and maybe Netcomms I think?
As for who needs it: you’d be surprised at how technically inept some people are. It’s truly amazing.