So which ones do both? Only Wavlake?

just like a website with various files and file types :)

Podhome is a hosting solution. Publishing is baked into the process by default. Fountain (with their RSSBlue partnership) is an AiO solution and includes a player as well (just like wavlake) There are others but I recommend looking at podhome first. There's lots of podcast hosting solutions and just a handful of ones catered specifically for music. Because RSS is open, there are certain standards but you can pick and choose what fields you actually utilize or even create your own as long as theres a compatible app that knows to reference it.

Exactly. Now tie digital reputation identity to it via nostr keys and now youve got the makings of a decentralized open network community.