Photographs are a great analogy. If you work to learn about how to take a good photo, and learn all the techniques around framing a shot and how different shutter speeds affect things you can take beautiful pictures. However, if you tried to submit that picture to someone as a painting, they will cry foul. Also most people don't consider your candids on vacation to be in the same "category" as a carefully crafted (or not!!!) photograph of a landscape.

In much the same way, sure you could dedicate your life to learning the craft of prompting an ML model to produce unique, novel, and interesting art, but these communities are saying "we want these to be considered a different class of art" and as mostly self organizing communities they are well within their rights to do so.