I think you overestimate Microsoft a bit. Yes they are good in marketing and yes they are big. But projects like Rust are just way better when it comes to design and philosophy. The reason is pretty clear: A language with passioned developers/concept creators is way better in the long-run than a project that has to run by force (no offense, but I really hate .NET and it is really, REALLY terribly done).
I should also mention that I am a developer as well, so maybe I am a bit more biased than other peeps here.