A game is intellectual property like a movie. If I copy and paste 1/5th of your game, you can sue me and win. If I copy and paste 1/5th of your blog post, as long as I put quote marks around it, I'm safe.

Games won't become free until it's easy for commoners to make them. Even with Unity and all the easy plug and chug game dev resources, it's still hard and requires multiple people with different talents.