I've always gotten the sense that he does these videos when he's at his lowest and that the incomprehensible screaming is some sort of bizarre primal therapy. This guy drips sadness from every pore.
This fellow's YT channel says he has has 932 subscribers and 489149 total video views.
I bet he has benefited a lot from letting it all out in the wilderness and trying to be entertaining at all costs for at least five minutes once a week. I'd probably be a happier and more sociable person if I did something like this, but I'd be too hung up about it, afraid someone would see or hear me.
My best guess is that Tyler Durden has him kidnapped and he's been doing exactly what feels good to do only because he's being held at gunpoint off camera.