There’s a Bandcamp app that does that, if you find it an insurmountably terrible burden to drag some files onto the iTunes icon in your dock.

What does this mean? You just listen to music in your head?

And Bandcamp's target audience prefers to own their music and knowing that it will be on their device of choice tomorrow or in 30 years without the fear of losing it due ending licensing deals. Not to mention all the obscure and rare music that never made it to streaming services in the first place.

Your preference is well served with Spotify & Co. No need for Bandcamp to use the same streaming approach.