Earlier quoted context omitted.
I see big time indirect revenue - with all of a sites actions/users moving through Google, they can gather way more (potentially private) information about a user - all the better to sell targeted ads on. Call me cynical, but that was the first thing I thought of when I saw this.
Call me cynical Cynicism is warranted when it comes to Google. The fact that they gave NSA direct access to their systems; the fact that their Street View cars collected personal information through wi-fi networks, etc. means that "Don't be evil" is just a facade.
It's the equivelant of the the Streetview car capturing 'public property', if you want 'privacy', put up a big fence and don't broadcast your SSID.
As for the NSA issue, I'm not going to defend google too much there, but you've seen what happens to providers who didn't comply... I would put that down to more a 'The US govt is pretty hostile to privacy' more than "Google is evil".
On the scale of 'evil shit' happening in the world. Google collecting my Wifi network name ranks about similarly to 'J-Walking'...