>A few years ago, a man named Son Jung-woo was arrested for running what was the largest child porn site in the world back then. His sentence? 18 months. The U.S. wanted to put him away for life, but the Korean courts would not deport him.

This was the subject of the "Welcome to Video" episode of Darknet Diaries[1]. IIRC, he couldn't be extradited to the US because he was facing a lawsuit in Korea, one filed by his own father seemingly for precisely this side effect.

[1] https://darknetdiaries.com/episode/131/