“Found footage” horror is nothing new. The style is actually called ‘dogme’
The style was extremely popular in the 90s, particularly in Europe. (Google Dogme 95). It in fact has nothing to do with found footage at all. It only looks that way in films like Blair Witch Project. Actors generally have no script to follow and completely improvise their lines. The camera is always hand held, and only natural/available lighting is used. No film lights. Therefore this guy isn’t revolutionizing anything, he’s doing something that was already done to scare desensitized iPhone addicted teenagers, who weren’t even born when this style of filmmaking was relevant or popular.