> And because it’s a different technology it is not subject to the same local monopolies that cable is encumbered with.
Exclusive francise agreements between municipalities and cable operators have been outlawed since 1992. But it's generally uneconomic to overbuild a new network with the potential to touch every home unless a large portion will subscribe.
Fiber internet is typically much better than cable internet, but cable internet is good enough for most people, so they're unlikely to switch unless it's significantly cheaper, which it often isn't -- especially since local incumbents tend to lower prices or rollout better service when a new entrant is entering the market (or announces they will ... Google Fiber city selection announcements drove lots of competing rollouts even though Google didn't install anything in those cities).
Regulation requiring wholesale access / line sharing / or strict separation of first mile and service infrastructure would allow for competition in service and routing, without having to build a 3rd last mile network. Congress did this in 1996, but the FCC walked it back for cable, the courts said if it doesn't apply to cable, it doesn't apply to telephone, and the FCC said internet over power lines exists and provides competition despite the lack of providers. Congress never came back to make clear that it wanted line sharing, so it disappeared from the mainstream.
I have municipal fiber where the municipality handles last mile only and I have a choice of IP service providers. But installation was very expensive and monthly service is also expensive relative to the ILEC and the cable company, although the cable company service on my street ends before it reaches me.
The cable and telephone companies have a major cost advantage that they can rebuild their networks with a good expectation of customer uptake; and they're allowed to manage the finances of build out however they see fit. The muni fiber (in my state anyway) has to bill customers for the costs of install and even if it could self-finance a build out to service all homes, wouldn't see a lot of uptake because most people find their current service to be good enough.