I see, so the answer is the kind 31338? Both fanfares.io and npub.pro could both become RSS bridges sourcing from people's 31338 events instead of kind 1, and publishing a podcast could become a thing that doesn't require a platform, you just publish events and later you use any bridge out there to provide an RSS feed -- until podcast players start connecting to relays directly instead of using RSS (there is a PR to AntennaPod already, we just have to change the kind number and event format).

I'm not interested in the Lightning-gated stuff for now, and I think that will be the last thing someone publishing a podcast will worry about, since podcast players won't support it, but I think in the future that could become interesting too.