I have to feel that on some level, actively seeking out jobs where you review CSAM on a daily basis should be at least something of a red flag to those employers.
Indeed, I'd hate to be the recruiter for that. I can't imagine the kind of psychological profile you'd need for something like that. The end of the article describes the psychological cost the investigation had on the investigators who were parents themselves.
But even at an algorithmic level, it seems like there are all kinds of red flags you could pull out of public posts and do a much better job of redirecting potentially victimized people to some organisations doing meaningful work to help victims.
How many categories does my online profile fit in based on all my interests, and how many hundreds of bright people are wasting their lives to discern that I happen to like A + B + C and I'm in financial bracket F, with political leaning G ... to try to show me an advert I'm probably just blocking anyway.