In this case, as a solo dev, it's probably quite justified to be honest. I doubt ConcernedApe would have really been able to continue solo-ing it with this level of success if he also had to maintain distribution channels, sales/returns, marketing, legal stuff on a global scale.
It's probably the big name studios who already have entire departments to do that kind of stuff that feel they're being ripped off.
Actually the more you earn the worse the deal is - he's probably paid about $100 million for what amounts to $100,000s of labor if he paid people to take care of this stuff, and some (low) millions in taxes collected for various jurisdictions. Dude's personally bought Gabe a ship in exchange for some accounting.