[vidarh]

They were all legitimate concerns, though. Making Dropbox "work" required overcoming all of those issues, and they did. Maybe Relaybeam can make it, but he'll need to have answers for those issues, and much more to do so.

EDIT: In fact, they have far more to overcome: Dropbox didn't have to overcome negative network effects. E.g. people will ask why they can't email instead, whereas giving people a url to get at a file did not make things worse.