See, for me I like that Bandcamp is just a store. That I see an artist I like on social media, click their bandcamp link, and if I like their music I buy it. I don't use its recommendation features, and the only social feature I use is the ability to follow an artist and thus get news-bulletins about their work.

Once you get to an artist's page, the UI is simple and clean and Just Works. I can see their releases, buy and download them easily. That's what I want when shopping.

Imho, Bandcamp shouldn't even offer that kind of $20 "promotion subscription" thing you mention. Just sell music, take the cut, and be done with it.

Honestly my only real UI complaint about Bandcamp is that artists often move between labels and collabs and the label runs the bandcamp page so their music is mixed in with all their labelmates. That's where I find it gets very confusing. Like most of Lauren Bousfield's albums are at

https://laurenbousfieldanyev3r.bandcamp.com/

except her latest album which is here:

https://orangemilkrecords.bandcamp.com/album/salesforce

and is not linked from her personal page at all. Another album (Palimpsest) is linked from her personal page, but if you click on the artist of that one it takes you to a different label (https://deathbombarc.bandcamp.com/).

So obviously something is horribly wrong with navigation in how it handles labels and the like.