It's the only term I'd ever seen for it, in any context, until the last couple years. And I'm not a 4channer. Pretty sure it's just another euphemism-treadmill thing. (not that I mind in this case, I think the new term's fine, and certainly not worth fighting over)
What's "the industry"? The relatively new industry in moderating Internet communication? I've certainly only seen the term "CSAM" coming from cops and prosecutors very recently, and they're rarely shy about using their jargon in public communication.
[EDIT] I believe you that it's the term in vogue now, to be clear, but I'm skeptical it was as dominant, even if present, until relatively recently. If it was, then that entire world only recently started using it consistently in public communication, certainly. But, again, it's also fine, I don't mind the new term.
