Guys it's simple, Nintendo is stuck in the old ways. If they don't adapt, then they're gonna crash and burn. Survival of the fittest style.
Youtube isn't very popular in Japan anyways, they use NicoNico. But, surprisingly enough, devs are adapting to Youtube, it is just that Nintendo is a little slower or something else.. When you look at it, they're not having great sales, and their fans are trying to help remedy that but.. oh well.