Stable Diffusion and AI in general seems to be big in marketing at least. A friend decided to abandon engineering and move to marketing and the entire social media part of his job is making a rough post, converting it to corporate marketing language via AI and then generating an eye catching piece of AI art to slap on top.

When video generation gets easy he'll probably move to making short eye catching gifs.

When 3D models and AI in general improve I can imagine him for example generating shitty little games to put in banners. I've been using an adblocker for so long I don't know what exists nowadays but I remember there being banners with "shoot 5 ducks" type games where the last duck kill opens the advertisers website. Sounds feasible for an AI to implement reliably. If you can generate different games like that based on the interests of the person seeing the ad you can probably milk some clicks.