This is a 19 year old kid... admits to knowing the rules and deliberately ignoring them...
Its one thing to fly like this... but posting a video admitting you are breaking the law...
I guess he will have plenty of time in prison to think about the foolishness of that if he ever hits an aircraft.
Not a Multi-copter by the way - this one is a fixed wing. (Not in the USA but still illegal)
https://www.youtube.com/watch?v=DUotX5-0q0U