Yeah I can see this. I also think there’d be quite a few that just aren’t interested in the fame, or maybe want to keep their stuff private.
I know a person who writes her own songs every so often. They’re usually made as a way of dealing with something going on in her life. I had no idea about this until after like five years of knowing her she shared one. It was beautiful, she has a great voice, and she plays the guitar really well. Since the pieces are so personal it’s just not something she’ll share with most of the world.
Is she a Mozart? I don’t know, maybe. To me at least the experience was really profound.