The "success" here is completely insignificant in comparison to the huge costs to society. That you even feel the need to qualify your statement just shows that the artificial demonization of this material in order to justify a surveillance state has worked very well. It seems that by now people have completely forgotten that the actual problem is children getting hurt, not pictures of it or teenagers "sexting" each other. For all we know this person has a picture of a nude teenager, which does not even qualify as pornography in most countries. There is a reason this material does not get shown to the public. With the strong focus on digital material, the police gets easy "successes", and can justify any and all surveillance, but does not actually prevent any child from getting hurt. While it is difficult to get information (what a surprise), it seems that most acts of child abuse do not actually end up documented on the Internet and that commercial production is basically non-existent, as following money-trails is very, very easy.
At the same time, the police-state and the fascism that universally follows it get more and more established.