"Challenges" exist as a means for the kikes to see how far they can push the goyim into voluntarily causing themselves harm, pain and death. It is a psychological experiment on a global scale where they test their latest mind altering tricks and techniques. So far it seems the kikes have a winning formula as the NPCs keep doing more and more dangerous things for a small high of dopamine when they make these videos. Sheeple are actually voluntary lab rats.