who the hell makes TV programs and broadcasts them to the Rim

A cathode ray tube display for showing moving pictures with sound. Even on the rimworlds, there is often an old transmitter running something at least marginally interesting.

https://rimworldwiki.com/wiki/Tube_television

A high-tech flat-screen television with crystal-clear image and rich color. Picks up transmissions from ancient satellites and ubiquitous data cards.

https://rimworldwiki.com/wiki/Flatscreen_television

So who?

I think that it is the same people who made the sattilites for the orbital power beam targeter.