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'll try to explain why I have an issue with what is happening here. Yes, I agree with almost everything you said. However, the issue is that platforms are consolidated. Depending on your chosen format of content, there are only 2-3 viable platforms to reach people - and for some types of content, only one. And if those very small number of platforms decide to, or are pressured to, delist content or a content creator…
There is no shortage of broadcast platforms. They are not consolidated. In the podcast space alone there are apple, Spotify, YouTube music, stitcher, and self-hosting. And then there are all the non-podcast broadcast modalities.