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.
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.
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.