They don’t care. If there is no immediate and severe punishment for it then it doesn’t matter if we ‘know.’ In 10 years the only line will be the official one and we’ll just look like conspiracy theorists with half remembered facts. They dont think you’re stupid, they know they’ll get aways with it and they don’t think about you at all.
My understanding of AI art models is shakey at best but I think I remember that it basically uses the images to create a static (Litteral static like old school TV screen snow kinda) static model based on the image. Then it extrapolate based on 1000s of such static sudo images to create the original work. On a small scale I don’t think of it as theft. It’s not unlike a person using their past knowledge of image concepts to create a new image. Everyone hates AI though.