This looks great!
Have you considered API with podcast index to pull existing feeds? Your library is understandably sparse but there's thousands of tracks available on the podcast index (which includes the entire wavlake library and 2x more tracks on #demu).
An immediate issue we would face is duplication. To distribute our full catalog on your platform, we'd be duplicating feeds. We are already using the same rails for our existing feeds so it would make more sense to import an existing feed vs creating new ones.