My point is was that spectrum doesn't scale. There's X gigabits per second available over the air, and a similar X over a cable. For cable companies they can push equipment closer to the home and have fewer subscribers on the same line. I suppose Verizon could do the same with more towers, but imagine doubling the number of towers to support double the bandwidth (or something like that). As people have pointed out though, the congestion is specific to connections that carry netflix.

There's a limit for mobile bandwidth, where also the number of towers won't help; but cable is different - sure, at one point they have to put proper fiber to the home (and it's economically feasible to do so, if there's actual competition instead of monopolistic ability to charge huge prices for weak service), but after that you can have as much bandwidth as your routers can service.