Unfortunately, the Fountain app is simply not as good as Podcast Addict.
I've used Addict for many years, it's great.
I switched to Fountain around 8 months ago. I added sats from my stash. I have been tipping and zapping for good shows.
But the Fountain app would occasionally delete an episode, or no longer let me listen to a show, or some other strange things that inhibited my podcast enjoyment.
Two weeks ago I switched back to Addict, and it's just so smooth.
But now at least I have Nostr so I can zap podcasters on here for good shows.