I don't browse the dark web so I cannot make a solid first-hand counterargument. But I seriously doubt your comment, given the amount of illegal material there,

I don't browse the dark web so I cannot make a solid first-hand counterargument. But I seriously doubt your comment, given the amount of illegal material there, including most of the dumps from the thousands of past data breaches. Even if your comment is true regarding text content, it is almost certain that also they will try to capitalize on LLMs for improving their cyber crime codebases.