I think in this instance the issue is that these tools shouldn't be available at all to anyone, adult or child. There are not many use-cases for generating porn from images of real people who aren't porn stars and most of them are not good.
I don't think the genie is easily returned to the bottle and the cure may be worse than the disease.
I don't necessarily like the idea of punitive justice in general but that's the framework under which our society is currently operating so it's time to make lemonade I guess.