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The Windows Subsystem for Linux is now open source.
(blogs.windows.com)
This is a most excellent place for technology news and articles.
I know they are doing very well, trust me, I've seen the inside of the beast. It's not Microsoft either, any megacorp will talk to you in terms of how much they lost by not fully monopolising a market segment.
And that is my point, not that they don't make insane amounts of money, but that it will never be enough.