Radio federation
What is the problem you are facing?
Radios are spread throughout different servers and typically are 10 or so per server. -> One needs to switch servers in browser to listen to different radios. When using a client, it adds an extra complication: Subsonic API needs auth, so one needs an account.
Ideally, one should be able to listen to any radio on the fediverse without server-switching, including desktop/mobile clients.
What are the possible drawbacks or issues with the requested changes?
Subsonic API might be ill-fitted for federated use. But even having federation working on web would already be a plus.