ban them for an exponentially increasing time period?
as long as they are clearly notified "you have been banned for 3 months, cheat again it will be 9" it'd do the same job surely?
as long as they are clearly notified "you have been banned for 3 months, cheat again it will be 9" it'd do the same job surely?
[1] Judge says: "If you commit another crime or are found in violation of your parole you will go to prison for X months longer".
It's a simple analogy that ignores a lot of extrinsic issues, but punishment isn't always a sufficient deterrent.