Google's motive is to make money, and they do that largely through advertising. There's nothing ulterior about the motive I'm suggesting. More information on you means they can charge a higher price for the privilege of advertising certain products or services to you. Of course, the fact that the same information they sell to advertisers is also easily accessible by the government with a mere subpoena, if even that, is of little concern to Google, Eric Schmidt, or remarkably even to many HN posters in this thread.