Great, yet depressing, summary of the current situation from the New York Times, https://www.nytimes.com/interactive/2019/09/28/us/child-sex-abuse.html. More can always be done to combat the problem.
Most of my time is spent helping companies investigate thefts of property or money. It’s one thing to catch a criminal who stole some property or some money, it’s a completely different feeling and reward to rescue children from horrific abuse.
This difference is why I built a dark web crawler in 2013 to help preserve evidence and catalog sites for an agency, joined HTCIA, work with Interpol, and generally assist with criminal investigations.