Earlier quoted context omitted.
> Comcast's oligopoly is largely established by the fact that rights-of-way and pole-attachment rights are monopolized by municipalities, which tend to approve only a single, or few providers. Only because, when municipalities do try to treat bandwidth as a public utility, which they can sell to all providers equally, Comcast and other large ISPs sue them. > It's not a natural monopoly. I agree, but I don't think it…
I think it's the structure of rights-of-way, pole-attachments and so forth as monopolies that props it up. The fact that municipalities get sued for trying to sell bandwidth is a problem, but it emerges, I think, because of the fact it's centralized in a government institution.
As the size of the "municipality" goes up, though, I agree with you that centralization creates monopolies that are not natural.