As someone who listens to a lot of niche artists, I was upset, that not all albums were present in MusicBrainz. So I came up with a solution.
Meet Lidarr++Deemix!
https://github.com/ad-on-is/lidarr-deemix
This tool helps to enrich Lidarr, by providing a custom proxy, that hooks into the process without modifying Lidarr itself, and injects additional albums from deemix.
There’s also userscripts to automate a lot of the process of importing data from Discogs into Musicbrainz. There’s lots of niche/rare albums that are on Discogs but not on Musicbrainz.