[Stranger43]

Plumbing or Highway constructions were/are highly complex high-tech when the government decided the private industry was unable to maintain it to the standards society needed 50+ years ago.

You might also be mistaking the fad driven high margin web for the rather stable internet sitting underneath it, especially if you go all the way down to the cable duct where a lot of rural houses are still using copper put down in the 30ies.

The problem here is that laying down cable ducts requires both "right of way"(often exclusively held by whoever laid down telephone cables in the 30ies) expensive survey work and real physical labor(someone have to an actual trench), all of which requires capital and if you already own the copper cable for no significant increase in revenue.

Things can be done with radio signals and i suspect whenever 6G mobile arrives it might be municipal, but radio will likely never match the bandwidth potential of even the first optical cables ever laid down.