C# has Microsoft behind it. D ... doesn't. There are plenty of people who aren't interested in using languages with proprietary toolchains. Those people typica

C# has Microsoft behind it. D ... doesn't. There are plenty of people who aren't interested in using languages with proprietary toolchains. Those people typically don't use C#. The people who don't mind proprietary toolchains typically write software for an environment where D isn't relevant, such as .NET or the Apple world.