https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/examples/value/blip-0010.md
All of this metadata is being sent to the podcaster in the keysend TLV record. It's a lot more than a message.
With keysend being no longer widely supported, as we shift to lnurl, the podcasters would still like this metadata, and we're discussing how best to get it to them in a way that is private if they choose to keep their stats private, or if listening data should even be private.