The dark internet is several times larger than the surface internet. It would be impossible to take it down without a world-wide EMP. They have already been fighting child pornographers. It is one of their larger objectives but all they can really do is take down the sites and expose people's information. They can't actually stop the act of making the porn.
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I'm aware they can't stop it, but they can deal a great amount of damage. Exposing the people is super effective.