I’ve wondered the same thing. My working theory is that the ai art models are more interesting to a wider group of people than the language models, meaning they get better returns on the massive sums needed to invest to train such models. Ai art is really exciting for anyone who has ever dabbled in art before, because it can do things which I am utterly incapable of doing. For that reason I’m happy to pay for it. Ai language is not as exciting because it can basically perform the same tasks I can. So it’s interesting as a curiosity, but not as something I’d pay for.