> The only place monopolies tend to emerge is heavily regulated areas that allow for regulatory capture (laying fiber is a great example of this).

No, actually laying fiber is a great example of the problem with a free market.

It's not regulations that make it hard to put down fiber, it's property rights. Without some sort of regulation or government action (such as eminent domain) it's impossible to build out modern infrastructure. There will always be some person with property right in the way of a cable line. You can beg and plead with them to let you bury a line (including pointing out that it's very temporary disruption of soil) and they can still just say no.

It isn't unusual for a phone company that's looking at a difficult land owner to say "ok, screw it, we'll just have to take a 90 mile detour because the guy that owns that 500 yard strip won't let us bury here". Imagine how much harder that is if the land owner is related to or owns stock in a competitor company.

We have been able to lay as much fiber as we have in the US because there's a bunch of regulations around right of way that ultimately grants burying rights near public roads to utilities companies like ISPs. Without those, it'd be almost impossible.