A piece of passion.
The majority of behaviors in the world are motivated by seeking rewards, but there are also some actions that are done without expecting anything in return. On the Internet, we call this "doing it for the love". As a result, multiple versions of a game are born in the hands of those passionate gamers, who painstakingly recreate a gaming world, using their own hands to bring joy to more people, all for the sake of their love for the game!