Earlier quoted context omitted.
I totally respect all of those examples on their merits, but IMO if these are the best examples out there, they all (even aggregated together as a single leak) pale in comparison to Snowden leaks.
1) I'm not sure that I agree with your judgement of the significance of those events. 2) Doesn't it stand to reason that papers that are more significant than those that were previously published are almost certain to be published, given that papers of lesser importance were published?
Stakes are higher when there's more significant information to be published, so I would say it's not necessarily obvious to me that more significant information is more likely to be published.