I think we already got this one covered
We already have a government backed initiative to handle this one, in fact most countries do. It's called The Police, and backed by billions in funding. No it doesn't catch them all, but I feel it does a better job than some charity and a bunch of script kiddies would.
Injustices? Yes plenty of those too, including hundreds who've had their credit card details stolen and found themselves on the receiving end of dawn raids across Britain and the US. The Police never were perfect unfortunately.
But I fail to see how an organisation that takes no consideration of local culture and laws, but in a rather American manner decides to impose their own can be better than the organised law enforcement we already have. The Police are quite dedicated to the task too I think you'll find, have excellent methods of searching out paedophiles and the results are usually more pleasing.
Rather than shutting down a bunch of websites, prison seems to be a much better way of dealing with things. It's a karmic thing really, kiddie fiddlers gang raped and tortured warms my cockles somewhat more than taking away their internet.
Look we have no right to say that consensual sex at puberty is wrong if the culture we're interfering with says its okay. What we do have a right to do is stop that and worse in our own country, where we are entitled to say its wrong.
As for Child Protection Services the world over. They are usually worse than the people they take kids from. They certainly have no regard for children, and while none of us would disagree with removing kids from sexually or violently abusive parents, this is hardly the reason 99% of children are ripped from their homes.
Tell me a single parent that was forced to leave her kid in a car while working nights is worse than ripping a child away from his family, and placing them somewhere where they will suffer all the kinds of abuses we cringe about. Tell me that literally destroying that child's possibility of a decent education because of mental trauma is worse than playing with his toys by himself for a few hours.
Yes we'd love to say "get child care, a baby sitter or a relative" but usually these people are estranged from family, can barely afford to feed and clothe their kids, certainly can't afford over night child care and are usually refused the services they're entitled to by judgmental people working in social services.
Those are the people I'd love to see prosecuted, along with the CPS employees who negligently place children with foster parents that have had no background checks and are not inspected for abuse.