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CSAM, artificial or not, is illegal in the United States.
https://www.justice.gov/archives/opa/pr/man-arrested-producing-distributing-and-possessing-ai-generated-images-minors-engaged
I see. I’ve looked up the details. Obscenity - whatever that means - is not protected by the first amendment. So where the material is obscene, it is still illegal.
https://en.wikipedia.org/wiki/Ashcroft_v._Free_Speech_Coalition