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: https://musicbrainz.org/series/bdaf27b6-40c3-4f2a-a5e1-2316186ae4ba
But FÜGENE series has MEGAREX as artist: https://musicbrainz.org/series/a07fa772-8553-437d-8647-7fb655be4c21
Label has been marked as artist on Miraichaya / 未来茶屋 albums by Miraicha Records: https://musicbrainz.org/release/b0988502-41c3-4344-b748-55ef09e4eba9
And on A Taste For Emotion by Emoism Records: https://musicbrainz.org/release/4430d119-f759-43ed-a870-d5096337e031
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.