This amazing shortcut shared by u/AnthropicMachine on Reddit can transfer your Spotify-exclusive podcasts back into the Apple Podcasts app.
How to Submit a Podcast to Apple Podcasts
Joe Rogan Renews at Spotify, but Will No Longer Be Exclusive - The New York Times
This is why I moved from Google Podcasts and PocketCasts to Spotify
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How to uploaded your Spotify Podcast to Apple Podcast (from Spotify for Podcaster Platform)
How do exclusive podcasts fit into the forever war between Apple and Spotify?
Spotify is Breaking Podcasts
Spotify is reportedly dropping 11 original podcasts
Spotify's podcast exclusive days are over as Joe Rogan's show expands to other platforms
Joe Rogan's podcast coming to Apple, and under new Spotify deal - MarketWatch
Spotify loosens its grip on exclusive podcasts - The Verge