[Beldin]

Sure, but the extent differs greatly. Imagine someone doing this to enter an additional genre unburdened by their well-known works - so not "quit the band, band reformed under new name" stuff. In how many genres can a very prolific and competent artist deliver quality works concurrently? 10? 20?

How many profitable genres are there even on Spotify? 100? 200? Where is the line between "revenue-generating label" and "relegated-to-obscurity-by-your-own-choice label"?

I believe an artist can believably perform decently in several genres, but not in hundreds of genres. Moreover, I can understand being cautious when entering a radically new main genre from your usual fare, but I think there are plenty of adjacent genres where there is no significant taint (eg, sword&sorcery / high fantasy / urban fantasy).

As such, to me, there's a crossover point/zone somewhere beyond "several" and before "hundreds" where you're no longer doing it for separating your output along clearly distinct categories where such separation is expected/needed/warranted, but faking an abundance of choice to increase profit.

To me, 650 pseudonyms falls into the latter category - as another comment put it: SEO'ing Spotify to maximise profits. I dislike that, because it has nothing to do with competing on artistic merit.