By and large the only legal restriction on building a network in the US are related to construction permits & zoning I was presuming that when the company agre

By and large the only legal restriction on building a network in the US are related to construction permits & zoning I was presuming that when the company agreed to build a local network, it got an agreement from the local authority that nobody else would be granted a permit to do so. That's still a legally enforced duopoly. Or are you saying, that acutally doesn't happen? Cable franchises restricted competition for wireline video delivery but that got tossed a few years back. I am guessing that's because the phone companies also wanted to deliver video over the wire. So this still wouldn't break the duopoly.