If I understand correctly, cable and CATV are regulated differently, that systems that exist to retransmit broadcast stations to locations within the 35 mile radius of the broadcast tower that defines the market but for reasons of geography cannot receive the signal continue to be treated like monopolies and subject to rate setting by tariff.
I don't know how things are regulated in areas outside television markets based on radii around broadcast towers.
Yes, I agree that the technology originated with CATV, supplementing broadcast television, but came to compete with it too.