Sony's (NYSE: SNE) PlayStation Now, which streams more than 650 PS4, PS3, and PS2 games to PS4 consoles and PCs, is the most developed cloud gaming platform in the world. However, Nintendo (NASDAQOTH: NTDOY) has taken several steps into cloud gaming that raise interesting questions about the fledgling market's future.Back in 2014, Square Enix used cloud streaming to bring its massive multiplayer online [MMO] Dragon Quest X to Nintendo's 3DS.