Even though that musician enables free listening via Bandcamp, he does not distribute his work under Creative Commons or a similar license, which radically reduces the chance of lucky accidents where people like me stumble across his music.
I believe having more music distributed under CC or a similar license would immensely benefit musicians themselves, other content creators such as YouTube vloggers and Twitch streamers, and the end listener—everyone wins, except maybe for major labels and distributors.
(Note that CC license is different from public domain: the former mandates attribution, the latter doesn’t.)