While researching the nature of evil, I came across this:
18.104.22.168: "Are you evil?"
Jimbo Wales: "Indeed."
22.214.171.124: "Is Wikipedia evil?"
Jimbo Wales: "It should go without saying."
126.96.36.199: "Is Wikimedia Foundation evil?"
Jimbo Wales: "Worse than that, actually."
188.8.131.52: "Are you a Todo?"
Jimbo Wales: "Only on Tuesdays."
There you have it.
However, the one thing I do know about being evil is that you can't simply be evil, people need to believe you are evil. And odds are, beliefs about what is evil will change. Therefore, Larry and Sergey's credo of "don't be evil" may be less about being bad and more about being static. It's not a self-fulfilling prophecy, unless you believe that religion is marketing.