Sounds like you forgot to consider the energy cost of developing each AI model. Developing and maintaining a model is vastly more energy intense than 3d game dev. Keep in mind that you can ship a 3d game and ramp down gpu use for dev. But an AI model has to be constantly updated, mostly by completely retraining. Also, noone was clamoring to build massive data centers just to develope one game. Yet they are for one model.