I wouldn’t really call it “missing” while it seems kinda shocking at first that labels take that much of a cut, people don’t really realise just how many people are involved in music production. From marketing to designers to video editors, social media teams, managers that get them interviews and talk shows and spots at festivals etc. And then all the overhead that comes with those jobs, so finance, HR, IT and facilities etc.
So 1/3 is actually pretty decent and a much bigger cut of the profits than most people get from their labour.
Neez