I've seen a shift to Linux from Mac for a few years now, and definitely in my companies. I cannot speak for anyone else but my trigger was the "iOS-ification" of MacOS and the changes made to the hardware interface on MBPs. Once my Mac battery started to "football", I switched back to ThinkPads but this time running Linux as my daily driver. It's been great.

EDIT: I've been working with Linux since Red Hat Halloween, but I have never used it as my main everything computer until now.