This is impressive. We still have a 2009 iMac in daily use here, but it's stuck on an old OS. Which might lead to security issues. I've been looking into installing a modern Linux distro on it, or a hacked macOS upgrade. All those procedures come with caveats: certain hardware might not be supported anymore, or trying the installation will take time.
Maybe the ease of these installs is worth the telemetry that ChromeOS will send to Google 👀