Hundreds, if not thousands, of people die every year trying to get the 'perfect selfie', or the 'perfect youtube'. I've seen them on clickbait sites. Usually they will have a title like, 'Minutes before death', or 'Last moments of Life'. When I've clicked on some of these, it is usually someone hanging off the side of a skyscraper or a bridge while trying to take a selfie at the same time. Not very bright. You couldn't do that with two hands. Why would you try it with one?
However, this particular case sounds like a simple accident.
The worst thing is when parents do terrible things to their children trying to promote youtube hits. I guess they do not know that youtube reports child abuse to law enforcement immediately. And it's a good thing they do.