I hate this meme that “government banning monopolies will solve everything”. It’s especially non sensical in this case or in the AT&T analogy. The baby bells still had a local monopoly in their region and cities only had one phone provider - the baby bell.

The case is the same here. Even if you broke up the cable monopoly so they all became regional companies, you still won’t have a choice but for one cable/internet provider in that same location unless the local phone company decides to compete and lay fiber.