Everybody, the Steam version is on sale right now... It costs so little, it's not worth worrying about. Either get it or don't - you'll only miss out on a few little features here and there.
But it IS about money for the devs, whether you like it or not. They want to make a living doing what they enjoy, and the difference here is that Steam has tools that Itch does not, but takes more money from the devs as a result. Handing out the games to potentially thousands of people due to its initial popularity could result in a massive drop in profit, which would make it difficult to continue development. Hell, the price of the game is cheap for what it is, to be honest.