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. JR sold his catalog of intellectual property (podcast episodes) of his own free will and was paid very well for it: about $100M from what I can gather. What Spotify chooses to do with it is completely up to them, even if they bought it…
I don't think this is some irreconcilable gotcha. I support the free market as a tool when it delivers on the benefits that it can provide. Those are increasing choice and decreasing costs through increased competition and commoditization. If problems show up I'm happy to have legislation introduced to tackle those, such as not allowing food with known toxins to be sold.
It's like any tool. I support cars when they're used to deliver on the benefits that they can provide; getting people from point A to point B, and giving them the freedom to move between arbitrary locations. When they're used to run pedestrians over then I don't support that usage, and I will support legislation that limits the use of the tool in that manner.
Likewise if the free market is used as a way to reduce the availability of content, I can be against that while still supporting it as a guiding concept.