Asking here because I didn’t get an answer on IRC.
There are quite a few cases among Japanese albums in MusicBrainz where the record label has been marked as the artist on compilation albums.
For example, there’s a a record label called MEGAREX that makes series of compilation albums.
SPD GAR series by MEGAREX has Various Artists marked as artist: SPD GAR - MusicBrainz
But FÜGENE series has MEGAREX as artist: FÜGENE - MusicBrainz
Label has been marked as artist on Miraichaya / 未来茶屋 albums by Miraicha Records: Release “未来茶屋 vol.0” by 未来茶レコード - MusicBrainz
And on A Taste For Emotion by Emoism Records: Release “A Taste For Emotion” by Emoism Records - MusicBrainz
Should Various Artists or the record label be used as artist in these cases? Personally, I would put them all under Various Artists - I don’t see any gain in adding a separate artist for the label.