Also, a few things 1) How much would it cost for Dropbox to build and acquire/steal those users? 2) Even if 1) is not that high, what is the opportunity cost

Also, a few things 1) How much would it cost for Dropbox to build and acquire/steal those users? 2) Even if 1) is not that high, what is the opportunity cost for dropbox to do so? Yes, they could move a bunch of engineers and PMs to work on it, but then they wouldn't be working on other more important parts of Dropbox. 3) It's not always about how much you get by buying a competitor, it's sometimes about how much you will lose in the long-term if that competitor doesn't go away. Think Instagram and Facebook. $1B sounded crazy back then, but how much would have Facebook lost if instagram kept growing and growing?