Most client PC are still running on Microslop Windows.

They are, as always, using Windows to sell all their other crap, especially Azure and 365. Things like their AD or office tools are tightly integrated into the cloud so you realistically can't even use the one without using the other.

At work, we needed a PC for a Linux-based Webkiosk the other day. The computer proposed by the colleague who actually orders stuff comes with a Windows license. I said we don't need that. A fruitless, lame effort was made to locate a substitute w/o a Windows license. I renewed my protest, but the feeling that the problem is me was already floating in the air. I gave up. We purchased a Windows license to run Linux. For the umpteenth time. It's like a Microsoft tax on PCs.