In a perfect world Microsoft would not exist, or where a different company.
But the Microsoft that exist fight standards, and create propietery protocols or closed programs, and created huge dependencies for these, so people with one of his programs must buy the others. Microsoft fiery defend other companies, but not on quality, but on poisoning the well.
OpenGL was one of the key pieces to code a game once, and play it everywhere, and Microsoft succefully made it secondary with Direct3D. It has continued fighting all standards, to destroy them, and in games have a unmitigated success. Games are a world of Microsoft libraries, and game dev's don't know how to build games withouth these libraries, and the games created don't withouth these libraries (or libraries that emulated them).
At this point Microsoft is a cerebral parasite, and removing it would kill the host.