It’s not like podcast players are particularly complex to build and maintain, so they don’t require that much cashflow. Podbean sustains itself quite well with the odd image ad and AntennaPod is FOSS. I think the problem is more the opposite, since competition is so easy and monetising it would suck interest out of it, Google has no interest in actually competing. Which is why they’re trying to build their own walled garden with uploading your podcasts only directly to YouTube, RSS feeds be damned.