From Play-to-Earn to Play-and-Own, XAI is leading the shift in gaming paradigms. The last bull market proved that pure Ponzi models cannot go far; a focus on gameplay is essential. Ex Populus's game is first and foremost fun, and only then about earning money. When players are willing to pay for the sake of "fun," the economic system receives external input rather than relying solely on existing assets. This is the sustainable GameFi 3.0.