My guess would be because Microsoft technologies were to tied to windows. If you, a non-corporate entity is creating a new programming language with aiming at b

My guess would be because Microsoft technologies were to tied to windows. If you, a non-corporate entity is creating a new programming language with aiming at being mainstream, why would you choose a closed non-multiplatorm ecosystem? Also, the JVM is better suited (much better performance) for running dynamically typed code. You also seem to be confirming .Net has "superior performance" over the JVM, from where do you get that? .Net still has a long way to go to in being as mature/battle-test as the JVM is in linux IMO.