Authorization and access control are different problems. You can use ssh to create a auth-free SOCKS5 pipe, for example (lots of us do this every day), but tha

Authorization and access control are different problems. You can use ssh to create a auth-free SOCKS5 pipe, for example (lots of us do this every day), but that's not an "open proxy" because it's e.g. listening on ::1 or on the internal network interface, etc...