Betting against the systems

I have been told that there is a way to set up an account to do the opposite of what a subscribed to system does. Since many systems loose a lot of money, this may be a viable strategy. What is the way to set this up for a subscriber? Also is there anything to prevent negative comments about a system?

You could in theory do a smart money versus dumb money strategy by going long the winning strategies and short the worst performers. Problem is, the worst performers will go away and also they may be worst because of the high commissions (which you would bear)

I will be surprised if C2 lets you short a system.