How is Comcast and Cox not a monopoly?

Most cities you have ONE broadband network and then some small dinky DSL or satellite networks.

Furthermore Cox and Comcast do not have to compete or practice capitalism like everyone else, and this is legal for them.

How is this not a monopoly and why does our current administration allow it to go on?
Update: Imagine how awesome your internet service would be if these companies had to compete like everyone else. They would "COMPETE" to see who gets your service and then no one really needs things like Net Neutrality to even begin with. But alas they can be the only game in town and the government allows it.
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