> Broadcast TV seems laughably irrelevant. It’s difficult to find official numbers, but under 1% of US households have no cable,

It's not that people are literally watching these on over the air digital TV antenna systems, but that if you have a "Broadcast TV" station in a certain market, it becomes carried by default on cable systems, direct to home satellite satellite dish systems, and regional FTTH providers' last-mile cable-tv-equivalent products.

Look at for example how all the Seattle TV stations are carried on Comcast or Astound's networks.