To be *extremely clear*, It would be one thing if they hadn't sold well over 10 million copies. So a small indie developer charges $20 for their game, extremely reasonable, and they sell 10 million copies. They made $200,000,000 dollars off this game. That's one fifth of a billion dollars. Split amongst the five person development team, that's forty million dollars per developer.

And it took them two years to put out meaningful content? I'm sorry if I sound "disrespectful" here. Heaven forbid I expect people who make $40,000,000 releasing an "early access" game to actually finish the game in a reasonable amount of time. Heaven forbid.

Now obviously Steam gets a cut, which I think amounts to 25% - 30%, so to be fair they didn't make 40 million dollars each, they made something closer to thirty million dollars each.

edit; Also the 10 million copies record was last April. It's likely well past that now. So yeah, they probably have made 40 million each.