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…
People support the free market because they like freedom. People conspiring to deplatform legal content cuts against that freedom. And they see arguments like this one as rhetorical tricks to get them to disarm and be colonized.
This is just the GPL vs. BSD wars all over again, with people claiming that freedom only means BSD-style and not worrying about the freedom-preserving aspects of the GPL and that if you're pro-GPL you're anti-freedom.