I share the disgust at slop music spam sneaking into Spotify's recommendation services last time I used them.

But I absolutely don't agree that Bandcamp does recommendations well. To me, it seems like they don't personalize at all. Maybe you're just lucky enough to share the taste of the (at least human) taste makers at Bandcamp. Spotify's pre-enshittification Discover Weekly was miles better than whatever they do. My experience with old brick and mortar record stores was that at best they stocked a little of the music I enjoyed, but didn't have a clue about it. Most often they didn't stock it at all.