Among others, this creates an incentive to keep the resource scarce and to not invest into maintaining and expanding it. Why? Because the lowest level infrastructure is a natural monopoly: Even if it was technically feasible (put wires next to existing wires, put pipes next to existing pipes, put streets next to existing streets), nobody can afford to do this. The lowest level infrastructure is only efficient if shared.
And for this simple reason, it only works well as long as the lowest level infrastructure is public good. This is true for all basic needs: water (pipes, sewer), electricity (wires), transportation (streets, rail roads) and even the internet (wires, radio masts and towers).
The debate about the latter one is also known as net neutrality. But it's really just a special case of the general pattern - if you accept internet as a basic need in today's world.
On top of that public infrastructure, a free market can and should evolve. But note that it will only be a free market if the basic layer access is non-discriminatory, which in particular means that it is easy for newcomers to get in. Otherwise you have maket distortion from day one, and all arguments about market mechanisms are moot. Which is unfortunately the reality in many areas, although its badness varies from country to country.