The short answer is: it's much easier to build in a greenfield environment where there is a "helpful" local government, ready access to rights-of-way, and underserved population, easy construction costs, access to labor, favorable tax climate, and a host of other reasons that come before "lots of people who want gigabit speeds".
The economics of building (or overbuilding) a gigabit fiber network drive you towards areas where you can get a high degree of penetration for your investment. That's not going to happen in a place like NYC or SF. The construction costs (directional boring) and tax regime (network cables are "property" for property tax purposes) mean that SF and NYC are probably going to be the LAST places to get Google Fiber.
Look it up. If you install $15M of fiber in/around town, you can bet your bottom dollar that the local taxing authority considers that real property and will tax you on it at appropriate rates.
In TX, colo providers have had to send business property tax bills to people who locate their servers in those centers. Sometimes those bills are quite shocking.
In CT, the local phone companies started putting DSLAMs on poles because it got them off the ground and saved them millions on property taxes because there was a rate differential between property that was pole attached and property that was on the ground.
Never underestimate the effect that taxes can have on the deployment, operation, and maintenance of business property. You can explain great deals of financial shenanigans to the real savings associated with avoiding taxes.
And who gets screwed? Anyone who doesn't have the scale or size to make avoiding that tax worthwhile. e.g. the small-business owner.
The short answer is: it's much easier to build in a greenfield environment where there is a "helpful" local government, ready access to rights-of-way, and underserved population, easy construction costs, access to labor, favorable tax climate, and a host of other reasons that come before "lots of people who want gigabit speeds".
The economics of building (or overbuilding) a gigabit fiber network drive you towards areas where you can get a high degree of penetration for your investment. That's not going to happen in a place like NYC or SF. The construction costs (directional boring) and tax regime (network cables are "property" for property tax purposes) mean that SF and NYC are probably going to be the LAST places to get Google Fiber.