I don't buy the stealing argument in general, though in some particular cases there has been some wrongdoing.
But to the larger point, I've watched a lot of videos about AI generated STL files. I have experimented a little. I'm dropping it for now. In a year, give or take six months, there will be a fun new aspect of our hobby, especially for those of us less artistically gifted.
For the moment you have to bounce around between different services (text to image, image to image, image to STL, STL to usable STL), some of which are crummy, and some of which cost money so I haven't tried them but I'm suspicious. You're still going to put in a lot of time just developing the workflow, finding the services and techniques you like.
This is going to work great in the future, but I'm going to let other people blaze the trail and then follow later.
Meanwhile, I'm having lots of fun with TinkerCAD and Blender.
When I was in a pinch I did use, I think it was Gemini, to make some paper miniatures. I needed some specific goblin pirates. I described each of them, asked for front and back views, did them several times, took the best, printed them out, folded them over, boom – I'm ready for the RPG session. This let me get figures with the exact equipment and expression for the NPCs.
Someday we'll be able to do that for resin minis, but right now it would require so many hours and so many subscriptions that I'm not interested, I have too many other cool things to do.