There are a lot of people in this thread giving reasons to fail, or not try. The one thing I learned is negative thinkers usually end up right. As far as they're concerned.
We all know that getting into a well selling niche, and joining all the dots, doesn't guarantee success. It needs the content to be a little bit better than the rest.
This guy has that little bit extra.
Personally I have no clue why because he doesn't appeal to me. With 39,433,076 subscribers and 10,160,585,204 views, I'm wrong.
The subject matter isn't what will attract viewers and keep them watching. It's needs that little bit of magic and an attitude that says "Yes I can"
Not, excuses for not trying.