This doesn't make sense to me. Having a lot of files stored on behalf of individuals does not translate into having a lot of files that users want shared or published. My DropBox account has several gigs of files but there aren't any in there that I'd opt to share publicly if they suddenly offered some kind of publishing platform.
Similar to email vs. Facebook, while there are lots of files people want to share, the reality is that _most_ content individual to users (i.e. not music downloads or software packages) is fairly private stuff.
Similar to email vs. Facebook, while there are lots of files people want to share, the reality is that _most_ content individual to users (i.e. not music downloads or software packages) is fairly private stuff.