Agreed, thats why its a long shot.
But to counter what you/I just said. Our police are divided into groups and each is looking to legitimize their existence. Currently the technology centred departments are trying to grow and legitimise their existence. In doing so they have applied and had far reaching laws enacted and seen a rise of arrests over technology based offenses. Not government harassment as such, just one or two of their police departments.
A major technology reporter for a big newspaper in Australia was attending a hacker conference in Brisbane and when he left the conference was “pre-arrest” and all his possessions seized. They promptly grilled him for information and copied his laptop disk etc. After a number of hours he was released and his possessions returned. He wrote an article on what happened and how this “pre-arrest” can be used to arbitrarily harass/take your possessions. Under the law they do not have to return the items seized and you have to go to court to attempt to get them returned if the police will not return them.
It may not be a government trying to harass/arrest you, but it can be just one over jealous employee of one police department who claims you have something, the police don’t know but take his expert word. They do not have to prove anything, just single you out.
Why give them the chance, that is my point. It can be made so that even public chunks cannot be decoded by the vault, so in my view it is very good PR to do so and makes it near impossible for the “lets censor the bad stuff” brigade and authorities to show you stored anything in particular.
Honestly I thought they were going to be stored with a second encryption so that the vault would never know or could know what was stored.