While you're at it, how do you explain Chrome OS? That's still Linux and you even get a semi-native shell on it. It's almost completely open source and there's even a couple of distributions out there that are build on Chromium OS (which is the fully open source version) that's being used to give life to old laptops in schools. Almost all of the limitations of Chrome OS either arise from being a web-firest OS or for security reasons.
Even their new OS Fuchsia is being developed out in the open.
Even their new OS Fuchsia is being developed out in the open.