Whenever anything of "yours" is stored on someone else's computer, it's not highly protected by privacy laws, largely under the assumption that it must not be as private as the stuff you store on your own computer. So the government or an attorney can get access to this data without contacting you personally, and often with very little court oversight. So remember, kids, just because something's in your account on Root Vaults, that doesn't make it yours.
And just because you can't see your own clickstream most of the time doesn't mean somebody else isn't watching it. *
Annalee Newitz is a surly media nerd who can draw a heart in the snow with her clickstream.