> I don't really understand why anyone who claims to be a proponent of a free market economy has an issue with a private corporation deciding what type of content they want to broadcast.

You don't understand why someone would want to have all episodes of their favourite podcast available in one place? Just because someone supports the free market doesn't mean they don't have preferences. Support of the free market just means that one wants buyers and sellers to be able to transact without coercion, it doesn't imply any specific opinion about the practices of a company.

I don't like bad products and don't want companies to do stuff like this. I don't particularly care about Joe Rogan, but I've had a hell of a time finding episodes of various TV shows that have had episodes removed (Community, South Park, It's Always Sunny in Philadelphia) from services, and eventually I just end up pirating that episode.

I don't think what Spotify's doing should be illegal but that doesn't mean I have to like it or that I can't say they're making their product worse.

If you are referring to people who want Spotify to be forced to do things by law, like keep episodes up (which would be bizarre), then I'm against that too.