The experience of using Linux is extremely similar across Ubuntu, CentOS, and Arch. The level of required knowledge and skill per distro varies, but the overall idea remains the same. That experience, and the experience of using ChromeOS, and Android, and MacOS, and Windows, and a Nintendo Switch, are all mutually distinct to about the same degree. The people saying 'Linux market share' are not talking about the kernel. They are talking about the degree to which the Linux Experience is a palatable one that the average consumer chooses to engage in. There is nothing Desktop Linux about ChromeOS. It uses the Linux kernel because writing their own would have been annoying. You can say that there is a definition of 'Linux computer' that includes ChromeOS, but it's not a definition that's useful for anything except feeling smug for inscrutable reasons.<p>NB: I dislike Linux.