I was thinking AT&T as a more relatable example. Pretty much everyone uses AT&T infrastructure of some type. Whether it's the actual cables strung by the phone company, or other companies needing to string cables on the poles installed by the phone company. AT&T was so entrenched, that it's easy to overlook just how vested into them we were.

HD Radio on the other hand is just something of little interest to me personally. By the time I had a tuner with that feature, it also came with bluetooth which meant my device was doing the work and the radio was just a legacy thing that came with the device.