Well I imagine he is learning a lot regarding that industry and the media industry in general.
Once you get to a point where you have so many fans and so much content you need to manage it and manage the fans as well, it ends up becoming a job specially when you have 1 or 2 million subscribers.
a lot of brainstorming ideas to advertise yourself/channel/content and then managing it.
So I guess you do learn quite a lot of transferable skills.
Contrary to what a lot of people think, you can only go so far with brain-dead videos. After a certain point you need to have a bit of intelligence to keep people interested and generate more subs, he may only be 18 but the lad is doing very well.
I love some of the comments he is getting on that video haha, there are some realllly jealous people.