Yeah they are. They literally went to court with Apple over it.Well Microsoft isn't really competing with any of those companies. Apple is mostly mobile hardware and services tied to that hardware. Facebook and Google are advertising companies.
Microsoft is gaming, PCs, productivity software, and cloud computing. There's some overlap in places like Google also does cloud and Apple has some gaming but they're all mostly chasing different fields.
They clash in places because Microsoft wants to do business with Apple customers in their ecosystem and Apple is a bully monopoly but that's not really a rival to Microsoft. Apple's whole shyt flows out of the iPhone.
Facebook tried to buy Activision.
Google is their only competitor in the cloud space.
Da hell wrong with you, you just wanna argue