Most big companies uses it for their internal applications. Most of them contract external consultant or companies to develop and maintain these applications. S

Most big companies uses it for their internal applications. Most of them contract external consultant or companies to develop and maintain these applications. So thousands of consultancies also uses it. These consultancies also integrate a lot of 3rd party commercial components. The component development companies that develops components also uses .net. How many startups that uses it? Probably not as many as there ought to be and definitely not enough if you ask Microsoft.