Prince is really something else

I don't understand why he took all of his catalog off of YouTube, and hardly clears any of his music for sampling, or for tv shows like American Idol. Do you know how many contestants could soar with his songs
(like Deandre Brackensick). He also took most of his songs off of iTunes. Somehow his music is on Spotify (don't know how that happened). Does anyone know why Prince is so protective over his music?