Running a cloud and developping an operating system are two separare activites that don't need to be tied together. There is a lot of proprietary software in co

Running a cloud and developping an operating system are two separare activites that don't need to be tied together. There is a lot of proprietary software in companies around the globe that rely on windows low level APIs and it will last for decades. There is a lot of things that are running outside the browser. The whole gaming industry is still tied to Windows directx.