Ask HN: Are there any all Linux corporations?

I read sites that are for system administrators (I don't know why, I'm a coder) and the majority of their posts are Windows, Azure or other Microsoft technology specific.

I know IBM has Linux, or did 10-15 years ago, across the org, around maybe 30% used Linux on the desktop even in Marketing. I don't know if it's still the case there.

It makes me wonder if there are any fully, just Linux corporations, no Windows.