Earlier quoted context omitted.
Instead of the "directly-streamed linear programming" model, you could do radio audio broadcast the same way you do GPS: just have the local radio towers spraying some selection of podcasts on a loop (with high enough frequency+bandwidth+compression that the effective audio rate is faster-than-real-time, unlike satellite radio), and then have "radios" in cars (or wherever) which catch the files and cache them. You ca…
That sounds super complicated compared to good old FM radio.
This would move that decision-making to the client device, which could follow any algorithm the user preferred. There would be no people "working" at such a radio station. It would just be a box out on a hilltop with an antenna, retrieving files from an S3 bucket and spraying them—a bit like a numbers station.
Now, there might be some curation going into what counts as "local content" for the box to download and broadcast, but it could be algorithmic or just economic. Picture something more like the "curation" that Public Access television gets: anyone who wants to show up at the station and book a booth for an hour for a fee can have a "TV show." In the same way, anyone who wanted to hand the maintainer of the box an RSS feed of their podcast could have a "local radio program" that cars could receive.
The key, here, is that there would be an unlimited number of such "local radio programs."
Don't imagine radio as it is today. Imagine driving into the vicinity of a city and "picking up" the YouTube channels of everyone who lives there.