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Coincidentally, Google has sorta done that too!

ChromiumOS/ChromeOS is built using portage, and is certainly rolling release. It's not really a traditional linux distro, but it's something.

Container-Optimized OS is based on Chromium OS and is more of a traditional Linux, in the sense that is runs on servers.

...and so was CoreOS before the equally named company was acquired by RedHat.

In a funny twist of events, the author of the grandparent comment above yours was indeed building that OS (Container Linux) at CoreOS :)