What makes you think the FAANG companies don't use windows? Spent four years at Amazon recently and unless you were a dev, you were more likely to have a windows PC than Mac. Saw zero Linux laptops.
Leave FAANG and most internal developers at large corporations are running Windows. It wasn't until I started at a smaller shop that I found people regularly using Linux to do their jobs, usually in a dual-boot or with a virtual Windows install "just in case" but most never touched it.
I'm presently working supporting a .NET web app (some of which is "old .NET Framework) but my work machine runs OpenSUSE Tumbleweed. I can't see that flying at the larger shops I have previously worked at. I'll admit, that might be different -- today -- I haven't worked at a large shop in more than a decade.
Most corporations have no interest in paying the cost of running a multi-OS IT shop nor dealing with the challenges of fleet management with both Linux and Mac that make running those fleets more expensive and challenging.
That's before you factor in that almost everyone in IT is a born and bred in Windows and in almost every case people tend to choose what they know best.
Depend on which FAANG I guess. Approaching now 10y at Google and I saw Windows laptops only used by very few sales people. Everyone else is either using Macs or Chromebook.
Fellow Googler here. I'm the exception that proves the rule. After 7 years of Macbook and Linux devices, I needed Windows for a special project, so I got a "gWindows" device and found it very well supported.
Aside from the specific Windows-only software I needed, I would still just ssh into a Linux workstation, but gWindows can do basically everything my Mac can. I was pleasantly surprised.
