> Forgot that Chomium was opensource but ChromeOS is not, so I guess I had no need to play semantics.

I won’t argue the semantics, but I will be a pedant :-) “ChromiumOS” absolutely exists and is FOSS-licensed. It’s a mess to build — basically a bunch of ebuild overlays for Gentoo’s build system and a boatload of custom tooling/scripts which produce images for a given system configuration, if I remember correctly. I don’t know much about it honestly, but it is open source! At least in the same way Chromium is.