This intrusive gray Dropbox pop-up causes games to minimize/freeze or at least blocks part of the screen while playing - couple times every day. Recently I decided I definetly need a lot more space for a proper backup solution and this single malicious feature changed my mind from "maybe I should just buy Dropbox premium, since I already use Dropbox for many years" to "I will NEVER pay Dropbox a single $, I won't reward such a malicious comapny with my money".