>I always thought in my head that this level of creativity would remain our domain for centuries.

From what I've seen these networks are rehashing learning set images into something matching some criteria to produce visually pleasing results. Not to belittle the results - it's impressive - but the stuff I'm not seeing here is understanding of generated material - nonsensical z-order, scale/proportions, configuration.

Fantasy images are an easy target because it's all about visually pleasing nonsense.