Why would someone release that preview DVD they got of an unreleased movie? Or of a bootleg copy of the next awesome Guns 'n' Roses album? Or a PDF of Harry Potter part 8?
Because they're people, they realize what kind of power they're holding, and stupid people crack and want to brag about it.
Remember when you were a kid and you snuck a peak in your parents closet and saw that Nintendo you were going to get for christmas, and it was so difficult not to brag to all your friends that you were getting it, but you ended up cracking and telling your neighbor billy, and your jerk neighbor billy cried to his parents that he wasn't getting one and your parents found out that you found out and then you got the belt? Kind of like that, too.