This nicely shows that they don't need more surveillance. A simple honey trap appears to fill up like a bug zapper tray in Mississippi in July.
No dark web, no Hollywood hacker shit. Just go on social media and pretend to be a pretty underage girl and fish meet barrel. These days you could automate this with a good adversarial neural net (including image generation!) that would engage predators and let them incriminate themselves.
The authorities don't do this because they don't really care. Child abuse is a political dog whistle but it's not a real priority. As with many child care issues there is an unspoken classism at work too: that only happens to the children of less responsible lower class people (which is false).