These projects were valuable to Apple and Microsoft for a variety of reasons:
* promoting their IDE: XCode builds faster, and has better error messages. You can use any .NET language with Visual Studio in the same project.
* promoting their platform: Objective-C and Cocoa let you create fast GUI apps in a standard way, and we don't need GCC anymore. .NET provides a useful feature-complete standard library over a variety of languages.
To contrast, Rust was made with the intention of simply making a better systems language. Rust doesn't have a standard library or environment tied to a specific OS or proprietary dependencies. Rust itself doesn't promote Windows, OS X, ASP.NET, Cocoa, IOS, Android, etc. That is what makes it seem much less likely that rust would be created by a corporation.
