Why is there a .NET dustup? Microsoft introduced closed-source C# extension for VS Code

Microsoft will introduce a closed-source extension for C# in Visual Studio Code as an alternative to the existing open source OmniSharp, according to a post yesterday by principal product manager Tim Heuer. This prompted a sharp retort from Miguel de Icaza, of Gnome, Mono and Xamarin fame, who declared it was “truly disappointing that Microsoft would subvert an active open source project by ramming in a proprietary extension to continue to lock down .NET.”