Technically you can stream the music you purchased on Bandcamp from their site, would love some statistics how it compares since probably only few people use it and artists also get a very high percentage of the album price (50%?). Now that I think about it, doesn’t Bandcamp also have samplers or radios or something?
I don’t see why artists would receive money for music you purchased on bandcamp, unless I’m misunderstanding what you’re saying. It isn’t a streaming service. The only money exchanged is the money to purchase the album. It’s not monetized otherwise.
You might be able to stream some stuff you haven’t purchased, but artists have full control over what you can listen to and what you can’t, so those are treated more as a preview of the album rather than a “stream” in the Spotify sense.