Musicbrainz has a lot of data. Listenbrainz has only 25k users. What's currently popular is heavily skewed. You can't rate music properly. The android app isn't starting at all. No pwa support. It needs months of your data in order to generate recommendations. Favs/likes/bookmarks aren't synced with a subsonic server. Playlists aren't synced with the connected service. It's just not there yet, if ever. I scrobble. I don't know why I still do it, maybe in the hopes that one day it'll skyrocket and become useful. One day. Maybe the financial backer is missing. Most importantly, the userbase is missing. I have contributed so many albums to musicbrainz and I could still contribute hundreds more, if not much more. I do not have the time to contribute so much stuff that I'm don't even love that much. It's just not important enough. It's like openstreetmap, owners do not care about adding their own info to it. As long as it's like that it's unimportant and not that useful.