My first thought is that it would be the very successful YouTubers that get approached by hollywood. And those people are already doing well for themselves independently and would most likely not want to move to the corporate culture without creative control.
Hollywood is looking for a slightly different skill set than what YouTubers do, but what they do want is that relationship with an audience. Filmmaking chops can be taught and nurtured, but that trust that some of these creators have earned is gold to them.
The Backrooms kid got to spend three years working on a project he was clearly passionate about. He wasn't chasing clicks, creating daily content to keep the algorithm happy or worrying about ever mysterious ebb and flow of Google's payouts. He had an agent and manager that got him a deal and probably points on profit and who will make sure he gets paid. Sounds like a pretty sweet deal to me.