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.
Rust support is solid at least.