That’s fair, but surely the concept of sharing music with friends isn’t so crazy? Not saying it was necessarily handled well here, but it seems like a feature many would and do want.
Copy a link send it as an IM, that already worked with ICQ. Update your status message in your message client, manually or possibly provide a client side API to do that, pretty sure there are scripts that do that for pidgin / Amarok, it also is definitely possible on macOS using Automator. There is no reason to involve a server other than possibly platforms like iOS not allowing interactions between apps in this way, which I doubt.