Now you can get your fix of “Bulletproof Monk” and “American Gladiators” — all without leaving the comfort of YouTube. Yes, the king of user-generated, short-form video is now embracing the other kind: studio-generated, feature-length films. Yes, this is the same YouTube that said long-form video was anathema to its business model. But I guess when the big MGM lion comes roaring, you make an exception. Some of the stuff that MGM will be contributing belongs on the who-cares list: dusty, old movies that never did well in the theaters or on DVD, such as the aforementioned “Bulletproof Monk.”