From what I've heard, it's more common in Europe and parts of Asia. I've personally never seen significant Linux use of any kind in the IT environments I work in, sadly.

It's all Microsoft product stacks, the servers, the endpoints, the cloud environment, all MS. Sometimes their Hypervisor would be VMWare, and their NAS was a Synology. But other than that, basically all Microsoft garbage.

I did work at one place that had a fair bit of Linux infrastructure. The lead network architect was a hardcore Linux/FOSS grognard. Really smart guy and was fantastic at his job, I learned a lot from him. But the only reason that company had Linux servers and a few FOSS implementations was because that guy insisted on it and managed all of it himself.

I also worked at another place where one of the older IT guys had installed a handful of SUSE thin clients at various locations for employees to clock in with. But right after I started there, management wanted me to switch them out for Windows thin clients. I pushed back but they insisted, so there went the tiny bit of Linux at that company.