&gt; Clearly their intention here was profits and since they didn&#x27;t see any - they kill it off. They won&#x27;t do it so nobody else should try to safe email either.<p>Um, of course their intentions were profit? Dropbox is a for-profit company, nobody ever questioned their intentions as being anything else.<p>And it&#x27;s not pure speculation; I&#x27;ve worked on enough internally-developed products to know it&#x27;s not always feasible to open source an entire service offering after the fact. It&#x27;s expensive enough to do between code scrubbing, legal reviews, etc. that you&#x27;re generally only going to do it for strategic reasons (i.e. you know you can never make money doing it but want to commoditize the market space to hamper a competitor&#x27;s growth, you want the community to help support your infrastructure, or your business model is open source + support).