The worst part is it'd probably cost less than $100 of fiber and labor to splice something into your building, maybe $200-400 of gear to light it up, and you'd have a 10 gbps pipe back to some colo. It's more economical to run new fiber in most places these days, even if the local ISP knows exactly where all the old abandoned legacy lines are run, because of subsidization and basically scamming. The big companies like Lumen keep their knowledge regionally compartmented, legally shielded, and deliberately obfuscated, because if it became known that existing fiber was already run to a place they claim they can't serve, they can't get access to yet more funding for their eternal "service for the underserved" government money grift.

I stumbled on old maps that showed a complete coverage of fiber in my municipality, paperwork from a company that was acquired, and which in turn merged, then was bought out by one of the big 5 ISPs. When local officials requested information regarding existing fiber, this ISP refused and said any such information was proprietary. They later bid on and won contracts to run new fiber (parallel to existing lines which they owned, which still had more than a decade of service life left in them at that point).

I estimated that only around 10-15% of the funding went toward actual labor and materials, the remainder was pure profit. The local government considered it a major victory, money well spent.