Since when does "cloud" require an API that's open to the entire world? That's never been part of the definition of cloud services before. And there's no compelling argument for why Apple should try and open up iCloud to people who aren't using Apple devices (which is to say, there's no good argument for why it's in Apple's own interest to do that; obviously there are arguments for why other people might want them to provide that access).
Also, there's no such thing as "FoundationKit". There's a framework Foundation.framework, but most of the iCloud-related APIs live elsewhere.
Also, there's no such thing as "FoundationKit". There's a framework Foundation.framework, but most of the iCloud-related APIs live elsewhere.