system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it possible for drug trafficking, underage pornography, and other websites featuring illegal activities to exist in the Deep Web?

I've recently heard of the Deep Web. Naturally, curiosity got the better of me and I started clicking links. I came across some very, sick things.

I would think that these sites could be taken down by the authorities without question. Why are they still up? I'm confused.
gpt
Imagine a classroom of kids passing around the answers for a test, the teacher may find the piece of paper on a kid, but has no way of knowing if he wrote the answer, used it or was just passing it on. Tor which is one of the programs that lets you browse the deep web will go through a number of nodes to fetch you the site you are looking for, and authorities don't know if you are looking for, hosting or accesing the illegal website or simply passing it on.