Sorry I was referring to single player games, mostly played offline. If I made them and sold them surely I could sell them on a disk or such with the intent that once downloaded or installed they are the player's property now to keep and install or uninstall as they see fit.
They take your game, change the colour of the hats that your men are wearing, make a million copies, and then sell it as a new product for twice the price, and you get nothing.