Because it's (mostly) useless bullshit. I mean, apart from generating fake images/videos, and cheating in high-school/college, what's the value proposition? It doesn't really remove humans from the equation, because you still need a "prompt engineer" to get any result that is sort of correct most of the time. So you pay for a superstar AI magician, you pay for the ridiculous amount of compute this needs, and you still need to babysit it in case it starts hallucinating, so what's the point?