The problem with AI generated images, in this context, is that they can be used to imitate the style of specific artists, meaning any unique talent and vision those artists have no longer has market value. The scenario you describe isn't actually a business model anyone is following, except maybe morons shitting AI porn onto instagram and trying to flog their patreons.
Obviously AI generated art has market value to companies with creative staff because AI is designed to devalue and commoditize the work of actual artists, such that the work of all artists can be replicated by someone on Mechanical Turk writing prompts for pennies a day (or some equivelent low-wage plebian drone.)
AI has already been used to steal commissions from working artists, and companies are already firing their entire creative teams to lean entirely into AI generation. The better the technology gets, the worse the situation gets for working artists because that's the plan.
I don't see how anyone can have witnessed the glee with which AI techbros danced on the graves of the art industry, ridiculing and harassing artists, calling them gatekeepers and fascists, and telling them their careers were doomed, and think this will benefit artists in any way.
I really want that to change, because I find this technology fascinating, but as of now the well has been poisoned, the bridges burned, war declared, and most artists with actual talent would rather starve in the street than touch anything AI.