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On this day in 1991, Linus Torvalds announced he was working on what would become Linux
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Yes, you are right, on all accounts. Pretty much all of cloud infrastructure is built on Linux, including Microsoft's Azure, except when you have apps deployed there that are based or dependent on legacy (.NET Framework and older stuff) or proprietary (AAD and stuff like that) Microsoft tech, but again, those are becoming more and more the exception rather than the rule. On-prem setups tend to be more mixed between Microsoft and "other" stacks, but Microsoft hasn't had the lead for a long time even there.
And you're absolutely right, Android runs on the Linux kernel; although the userspace is not pure GNU, the fact that Android runs on Linux is 100% relevant to the discussion since Linus is the lead maintainer and creator of the kernel.
The OC clearly has some bone to pick with Linus, I'm outta here.