I agree about being fascinating and thank you so much for the detailed comment. I feel there isn't too much information because of course the gatekeeping and processes are complex and it's their way of making money after all.
I agree the method you said with the AI UV must be the one they're doing it. I have to do a big research about ai models and investigate how they work because at the moment I don't know anything. Complex thing for me I guess would be to understand how to transform some image into UV via prompt or even after trying to make it fit in software like Photoshop. Also, another thing I think can be used depending on complexity and that I know a bit about, is using Wrap software for convertion.