Monopoly franchises have been illegal under federal law since 1993. Most places are de facto monopolies because nobody wants to compete with the incumbent. (Largely because the municipality won’t let them compete just in the areas that can profitably support competition. For example, that’s why Baltimore doesn’t have FiOS, whereas all the places around it do. The folks in the city government decided if the vast swaths of the city below the poverty line wouldn’t get $70/month fiber, nobody should be able to.)