There are 23 million rural homes in the US and about 3 million miles of rural public roads. Let's say you wired just the public rural roads (ignore going from the road to the house).
It costs $30,000 per mile to put up aerial wiring. $60,000 per mile underground. So we're already at $90 billion for wired poles and $180 billion for underground. And that's just for the wires--we're not including any of the switches and routers for actual internet.
By comparison, the Starlink system cost about an order of magnitude less ($10 billion).
Clearly not every public road needs wiring. Then, consider that you could run wired connections to wireless access points to increase high speed wireless coverage. 1 wire to light up dozens of homes in areas which currently have no service beyond DSL.