It is worth noting that Dropbox took a bundle of business problems that already had been solved in one small community and solved it for a much wider community.

It is worth noting that Dropbox took a bundle of business problems that already had been solved in one small community and solved it for a much wider community. Specifically, the problems of "cloud" file storage were being solved by AFS in MIT's Project Athena. So, to argue at Dropbox's founding that it was a toy would require first arguing that businesses didn't have problems that resembled "All the folks working on this class project need to have one accessible and shareable place to store files".