> And remember… don’t be evil, and if you see something that you think isn’t right – speak up!
The big issue with a phrase like "don't be evil" is that it is ambiguous and highly depends on the understanding of the word "evil" to the individual that reads that line. Google at this point is 80k+ full-time-employees, that I can guarantee will read that phrase to mean different things.
The newer code of conduct tries to codify what "evil" means, to lay a clearer picture for everyone what it means. That way it can't arbitrarily be applied for or against the company based on your an individual's beliefs of what that word means.
[0] https://abc.xyz/investor/other/google-code-of-conduct.html