Nice. How are you syncing and deduping the data? The page says it uses an API but doesn't go into detail of which. Is there storage and caching implemented?
Then I host everything on a firebase service where I store all data and serve it up quickly.
There are some small problems with de-duping when a podcast gets uploaded on multiple feeds, but I haven't found a great way to handle that besides comparing the titles/descriptions
You can add the RSS feed to any podcast app you want and it will automatically update whenever they appear on a new one