How about this. Take away all the musicians and their music and see what Spotify and all its software developers are worth by themselves.
Now do the opposite.
Figured it out yet?
Music is one of the most universal and important things in our culture. People define themselves and their identity with it, and most certainly value it and will pay for it.
How we structure our economic systems determines if it’s “cheap” or not and who gets the profits from it. It’s certainly not an intrinsic quality.