Google offering free Wi-Fi

The other day Google announced that it was going to launch its free wi-fi service in Mountain View, CA. Now, the author of the article says that Google "simply has more money than sense," but what do you think? I'm thinking that they want to find a way to track users. Ok, maybe not that, but at least get an idea of usage levels, then roll it out to the rest of the country, monetizing this "free" service with restrictions (e.g. a new interstitial initiated by the service? shown every 15 minutes of use? pop-unders?). I know they aren't in favor of overt ad-spamming, but they've got something up their sleeve, that's for sure.

More money than sense my @$$.