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I thought spotify was anal about covers which was why kamitsubaki doesn't have any uploaded but this doesn't seem to be the case. Granted I don't know if/how these covers work under their monetization scheme for the artist.
Also I guess they don't want to flood their song list with covers, when they make a lot of originals as is.
While it would be nice to not have to jump multiple platforms if I wanted to listen to covers, I guess it can be helped. Or take the YT Music pill, though not sure if thats an any better experience.