That is really overlooking a lot of time, effort, and money that many people and companies put into their podcasts. A lot of the best journalism and story telling in the world is in podcast form right now. That won't be the case for very long if the creators can't monetize their work.
Also: note that restricting entertainment to that which is provided for free is a big restriction.
this isn't really accurate any more. A lot of podcasts these days, in particular, the ones Spotify seems to pick up, are professionally produced audio dramas or documentaries that come with significant cost.
Look at some of the more popular ones like Homecoming with Oscar Isaac, Blackout with Rami Malek or Carrier with Cynthia Erivo, those guys and the teams behind it don't work for free.
After the podcast was over, it took about an hour or two to listen through carefully and edit the podcast down to something pleasant to listen to, removing the crosstalk, pauses, weird noises, and things I wish we hadn't said.
People who care more about their podcasts and have longer podcasts spend much more time researching and editing. That time has a lot of cost, especially for people with demanding jobs and families.
Imagine all the books that never would have been written if we seriously thought free Reddit r/writingprompts fiction should be good enough for anyone. "Fiction should stay open and free!"
Producing podcasts costs money. If listeners aren't paying for the costs, someone else has to. If the podcaster can't afford to pay these costs, they'll end up going to someone like Spotify rather than bankrupting themselves for our entertainment.
Look at all of the money made in the 90s Premier Radio Networks, Westwood One, etc. They aggregated content ranging from conservative babble to psychology shows to Art Bell and did very well. Podcasts could be a similar phenomenon as radio dies out.
Eventually AM and FM radio will be auctioned off to cellular carriers, and networks like Spotify will take over. The current podcast ecosystem only exists due to the benevolent dictatorship of Apple. That can go poof any day.
We are under absolutely NO obligation to support them. They like to talk. We may or may not like to listen. They are the digital equivalent of HAM radio operators, and Spotify is acting like worse than a leech on a free and open system.