Depends on your perspective if you look at it from the perspective enterprise where Microsoft makes a lot of its money its a different story. The enterprise's IT department (which is probably already running Windows with Exchange, Office and the rest of MS stuff) faces the following issue: Developers want Linux tools, but to IT, it makes sense to keep all employees on Windows rather than give developers the option of Linux in order to make their management easier. With WSL the problem is solved, everyone is on Windows and developers get the tools they need.