Generated via ublue's countme script https://github.com/ublue-os/countme/blob/main/growth_global.svg
Here is Fedora's upstream graph to compare:
The IT folk doesn't have any power in big companies. They get told what to install by higher management. And higher management usually knows fuckall about computers but does listen to consultants and fancy buzzwords which is something Microsoft is insanely good at.