A promise made in ignorance.
I wistfully imagine a day when it's just known that our present companies are evil due to institutional evils, due to emergent evils, and not because some cackling bastard plans to take over the world.
Google can no more avoid these institutional situations than any other corporation. It was never possible that they'd follow their motto. We should let the journalists alone with their fauxtrage when we or they see Google's latest fall from grace.
Still, this site is called Accepting Ignorance, which includes me accepting that of course Google's "Don't Be Evil" will be taken seriously.