I feel for the guy, making a living off of art is difficult. However, with an extensive email chain explaining the story was written as the ending of Minecraft, even going into detail about how it was to be displayed in game, an agreed upon offer (if a bit vague), and then an exchange of funds - with no immediate attempt to return said funds. I'm no lawyer, but that sounds a lot like a legally binding agreement. > So…
If he actually received $20,000 that still seems like a lot? Especially in a world where freelance writing is $0.01-$0.50 (pre-GPT3). And it sounds like at the time it was good money for the artist. I get that he feels like he was given a small amount relative to the great success of Minecraft, but I would hope he also realizes that it was risk free cash.
If he didn't think the money was fair, he shouldn't have accepted it. I expect Mojang would have simply pulled the plug and gone with someone else if he had done so.
This really just smacks of sour grapes that Mojang was sold for squillions and the author feels entitled to some of that. Legalities aside (the absence of aa signed contract may be a problem) but I don't feel he is morally entitled to anything more than he's already received.