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Electrical, telephone, and cable tv wiring actually have a huge first mover advantage.

Whoever wired the thing first gets most of the customers and can pay for the build out. If you overbuild a roughly equivalent network, you're unlikely to get a lot of customers and you're unlikely to be able to pay for your buildout.

It doesn't matter if you have an exclusive franchise agreement once your network is built; the business realities provide exclusivity.