> The /metadata/lookup API endpoints (GET and POST versions) now require the caller to send an Authorization token in order for this endpoint to work.

> The ListenBrainz Labs API endpoints for mbid-mapping, mbid-mapping-release and mbid-mapping-explain have been removed. Those were always intended for debugging purposes and will also soon be replaced with a new endpoints for our upcoming improved mapper.

> LB Radio will now require users to be logged in to use it (and API endpoint users will need to send the Authorization header). The error message for logged in users is a bit clunky at the moment; we’ll fix this once we’ve finished the work for this year’s Year in Music.

Seems reasonable and no big deal at all. I'm not entirely sure what "nice things" we can't have because of this. Unauthenticated APIs?