When they (finally) moved off S3 to their own setup it really said to me that they're going to IPO. Sure, a lot of companies the size of Dropbox (in terms of re

When they (finally) moved off S3 to their own setup it really said to me that they're going to IPO. Sure, a lot of companies the size of Dropbox (in terms of rev) do it, but a lot of those companies don't have profit margins that are directly related to S3.