Cable internet uses the cable TV network infrastructure to provide high-speed broadband internet access. Because cable providers are completely redundant from the local phone company, the cable internet solution is also separate.
While most other carrier services are diverse in long haul connections (across the country and around the world), they are limited by the last mile of connection and can mostly provide internet service through a local connection from the local phone company. Instead, cable internet access is an end-to-end solution from the cable company because they own the “last mile,” as well as the infrastructure getting to the last mile.
Increased competition from fiber deployments and mobile networks is causing many cable companies to now offer high-end fiber services in addition to the traditional coax.