I'm honestly more surprised that they use Windows at all.
Linus Tech Tips
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Microsoft fights very hard to keep governments across the planet use Windows and other Microsoft products (it's very lucrative market because of corruption and the fact that government regulations on what their employees must use are slow to change once established). And they have very close relationship with USA government specifically.
As yet no spaceship has suffered catastrophic depressurization after opening Linux.
ಠ_ಠ
This is why the background has no stars.
They actually use all three operating systems. Depends on the need. Some are better at some things than others. I have a friend who works at NASA and it's a requirement to learn centOS there. They also use kde plasma as their de on some of their computers.
Or maybe they bought Windows and changed motherboards…
I use Linux but sometimes use Windows to game. Still grumpy about this.