Chrome OS - a Linux distribution that sets apart from others by the fact that comes preinstalled on Chromebooks, relies mostly on cloud services and, lately, the ability to use Android apps and Google Play to get them. The latest feature seems like a real advantage to some users. Also, you can use Chromebrew to install Linux repository acces and standard Linux software. There reconstructions of Chrome OS, based on the open source Chromium OS, like CloudReady and Flint, that comply most of the components, but they are not 100% equal in functionality with the official Chrome OS. Also, you do not get automaticly updates top the OS. Regarding macOS, there is a way to install it on non-Apple PCs, named Hackintosh. It is probably a similar, easier way, to install the official Chrome OS on non-Chromebook hardware. To get the official Chrome OS, you need an extension in Chrome, a USB pen drive and a serial number of a Chromebook. My guess is that there is some type of Hackintosh-like method to get Chrome OS legally and install it on non-Chromebook hardware, like there is a legal method for Hackintosh on Tonymacx86. With this distribution, Linux adoption on PCs might explode, the end users having access to a lot off installable software, the Linux repositories and Android apps.