Yes, it's fantastic for indie game developers no doubt. After having a catalogue they can get a good paying job and build a career. Musicians, on the other hand, only get offered more exposure gigs.
I've published mine under CC here https://flickr.com/photos/patcito/with/84627477/
If music is your career, sure you have to get good fast and sell at every opportunity.
However don’t discount how good you can get just jamming out with friends for 30 something odd years.