It was mentioned in the threads, but I don't think it got enough attention. Mostly it comes down to money. Yes, customization, efficiency, etc of Linux, but also because every $ not spent on licensing is a $ you can spend.on making the data center better. So maybe it's buying.more hardware, or having more money for infrastructure like electricity , cooling, and bandwidth. Or just plain profit. Licensing is a nightmare with microsoft. Rather save the money and time and.make a better data center.
Power almost always needs a scapegoat. They are diversifying lately from people of color, and pushing immigrants again, along with other minotlrities like LGBT, and of course anyone who thinks their fascism is a bad idea. Just look at what trump is doing regarding educational institutions, media organizations, and law firms. Critical thinking is likely to get you killed.
More likely sore loser...