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Re:macOS 10.15 Vista by antisemiotic on Wednesday October 09, 2019 @04:45AM (#21201270)
Microsoft ships the entire Ubuntu, which does contain GPL3 code. Maybe they get away with it because it's not so integrated with the rest of Windows.
Re:macOS 10.15 Vista by Kipters on Wednesday October 09, 2019 @07:01AM (#21201927)
In WSL1 Microsoft only ships an implementation of the Linux syscall interface, the actual userland comes in the form of a tarball inside an appx package from Canonical, through the MS Store.

I don't exactly know how WSL2 works, but the main difference is that they now use an actual Linux kernel inside a lightweight VM, and that kernel's source is on GitHub. Userland still comes from appx-wrapped tarballs from Canonical.