Now that we're learning this lesson that centralized silos are brittle and operate in the interest of the owners not the users...

...please note the move toward centralizing podcasts into apps from Amazon/Audible, Spotify, iHeart, YouTube, TikTok etc.

If you like podcasts, use an RSS-based podcast player. Support the open ecosystem. We can only survive if you clearly see the threat and act supportively.

@leo
Related to your point:
there are federated podcast publishing apps, such as Castopod (https://castopod.org), and more general audio apps, such as Funkwhale (https://funkwhale.audio) , which allow podcast creators to publish to the Fediverse, making it possible to follow them from one's Fediverse (e.g., Mastodon) account.