I would give a simple answer: they don't care. They care about marketing and sales and Bing came "preinstalled" in zillions of computers around the world. That

I would give a simple answer: they don't care. They care about marketing and sales and Bing came "preinstalled" in zillions of computers around the world. That is enough for them. The crux of Microsoft is being harm at their ecosystem (PCs, Windows, Office, Azure, Dev Tools, etc). They are the business drivers. But even if their software and infrastructure is bad, it is used in almost all of the top companies in the world and the switch cost is currently very high.