I feel like part of the difference is how art vs code is viewed. You could make the argument code is art, though most don't have that stance. Visual art and music tend to be made by a few people, there is ego involved, you care who the artist is. Code tends to be made by shops and consumers don't know who the coders are. Programmers are already faceless.

I think it's also about money. Places code and code samples are stored tend to be large companies that are in tech and on the AI hype wagon. Bandcamp is not one of those places.