Cell towers already provide internet to everyone in downtown SF and have for 20 years. Just because you aren't using your PC with it normally doesn't mean it doesn't count.

Wireless is always cheaper than wired for an equivalent coverage area. It just requires less physical infrastructure. But in almost every other way it has inferior performance.

Agreed, problem is with everything SpaceX hard numbers are hard to come buy. So wireless will be cheaper, if satelites are cheaper than 5g and other groind based solutuons is hard to tell.