Please do tell.
Anonymous, encrypted storage on some one else's machine.
Government secrets? Better revealed anyway.
Personal documents? Seriously, a little paranoid are we? 10x encrypted copies on cd/dvd/bluray/flash/hdd/offsite backup would be more than adequate.
Evidence of collusion/cover-ups/corruption/etc.. better revealed anyway.
I honestly can't think of a single reason that anyone would need decentralised encrypted anonymous storage, except if they are upto something highly illegal, or of dubious legality, or dubious morality, and they don't want to be identified with.
Noting, of course, that I'm privileged to be living in a Western country where tolerance/understanding is at the point that basically 'anything goes', I can think of several uses if I was living in Iran, like one of my friends is.