I'm not sure what kind of arrangement Joe Rogan has with Spotify but my understanding is he owns his podcasts and Spotify is paying him for the exclusive right to distribute them. So what does that mean for episodes they refuse to host?
https://jremissing.com has the full list of removed episodes. Joe can fight back and just have them hosted elsewhere.
Publishing elsewhere probably will violate Rogan's contract. Hard to tell without seeing the contract. Spotify might already have violated the contract by removing episodes, he might be due more money, be free to publish those episodes elsewhere, or be locked in to the deal. Rogan should talk to his lawyer about it.
I imagine he already is talking to an attorney about it. I'll be interested to see what comes of it.