It's even less hard to believe when you look at what much smaller companies are doing in this department. Rovio (maker of Angry Birds) already provides free Wifi to a larger area of downtown Helsinki than Google is rolling out here, and they're a company that is 1/300 the size of Google (measured by revenue). That hasn't exactly bankrupted Rovio, so it's plausible that, to a first-order approximation, Google could provide free wifi to about 300 U.S. downtowns, if they really wanted to, without stretching themselves that far.