A more plain concern is how Zuck works with new platforms. There is the prior example of their own Facebook Platform, which took off really fast, creating a new

A more plain concern is how Zuck works with new platforms. There is the prior example of their own Facebook Platform, which took off really fast, creating a new niche with hundreds of thousands of developers, only to be crippled a few years on, alienating developers with constant shifting technologies, choking of communication channels and exclusive contracts with certain companies. Value is created in win-win situations, when both parties benefit. If developers fear they will not get their part of the win, it's unlikely the value will be created at all.