its a music platform where u can find music... don need to be some fancypants 'artist' to make music.. often music from libraries like some mentioned there are simply ppl makin music for money, not like an artist but like a job...
they offer u the ability to make ur own lists if u wanna be elitist on whos an actual artist and 'who deserves to be on spotify'...
a lot of the 'ghost' tracks also come from actual ghost producers who moved from making ghost productions for labels to doing it indie.
not all producers are some kind of artist brand or make consistently the same theme of music every track. i got tons of projects i out stuff under, like categories.. some have 1 track, others lots. (no i dont make money from it, but often ppl do... just a few buck on the side)