One sure-fire way to get the internet collective to do something you don't want it to do is to strongly tell them not to do it. That's the approach that Arc System Works is taking with Kill la Kill the Game: IF's story mode. Arc says that uploads and streams of the game's story mode are "prohibited indefinitely." It seems like Arc doesn't want the game's story being ruined, as it will not only spoil things, but also deter potential customers from a purchase. Why bother buying a game for the story when you can just watch it all online for free?
The real question here is...just how on earth does Arc plan on stopping people from doing this? Between all the ways/places people can upload/stream footage, this seems like a near-impossible task.