The problem with Google is that they're beginning to encompass too many things at once. Total information control is a dangerous thing, and it will always corrupt, even if your motto is 'don't be evil.'
It will become a bigger issue if Google ever ends up in less than beneficent hands. The inheriting company will have a whole slew of information and accounts to do whatever they please with.
Remember, it's this kind of control that makes us less than happy with Microsoft. MS wasn't that bad in the beginning either.