Mindustry is an example of a (very fun) game that is open-source-first. I'm not sure what Anuke (Mindustry dev) does for a living, but they are very fast to fi

Mindustry is an example of a (very fun) game that is open-source-first. I'm not sure what Anuke (Mindustry dev) does for a living, but they are very fast to fix bugs and implement new features. It's free on itch.io, and android, but costs money on steam and iOS. I would ask them what kind of monetization they get out of the game. They're likely an exception and not a rule. You can't expect to make a very successful game ever.