[bradleyjg]

Path dependency. .net may be open source and interoperable with all kinds of non-MSFT technologies today, but 5-10+ years ago it was only usable in places that went all in on Microsoft technologies. Those Microsoft shops tended to be older, large enterprises outside of pure technology.

Now fast forward 5-10+ years back to the present, are people that choose to start their career in older, large enterprises outside of pure technology more or less likely to be a technical co-founder or first technical hire at a start up than people that choose to start their career in startups or pure technology companies? For consumer focused startups I'd probably say the latter.

I don't know for sure, but I'd guess that startups trying to sell to exactly those older, large enterprises outside of pure technology are where you are more likely to find technical co-founders/first technical hires with experience at those companies they are trying to sell to. So I'd look there for .net stacks.