We don't exactly have many non-capitalistic economies.
But we have games that people made outside of the incentives of capitalism. i.e., because they wanted to make the game they wanted to make. This is what has created the absolute best games in existence. Not the incentive of money.
Was terraria made for the purposes of money? Was outer wilds? No. They were passion projects. Of course they had to earn money, because you need to earn money to survive, but that wasn't their primary goals. Contrary to games such as call of duty or whatever. Which are just incredibly bland in comparison.
I mean see how much microtransactions, loot boxes, etc. Is ruining the atmosphere of games and exploiting the hell out of people and kids. Don't tell me devs are putting that in because that is what their dream game would contain. No, they put it in purely because of capitalistic incentives. Would you argue that that is good?
Do you think those games wouldn't have been made without capitalism?
All of those examples are driven by people wanting to make a good game because that is their passion.
If they were given infinite resources to make a game, and would gain nothing else beyond just a decent standard of living or whatever, do you think they wouldn't made them? Because I think they would.