Releasing the source code would allow anyone to copy AND modify or extend the game as they see fit
So just like when you buy a bicycle irl and you are allowed to customize it and set it up as you want. Are you saying we shouldn’t be allowed to modify goods?
A house isn’t software, it’s more like getting handled the blueprints of the building. They already have access to the property what’s the difference if they have the blueprints or not