Earlier quoted context omitted.
Calling a Linux distro Gnu/Linux today is wrong because the actual Gnu code running is such a small part of everything. SteamOS uses Linux as much as Linux distros like Fedora and Arch and other Linux based systems like Android. A lot of gamers are also FOSS folks although not as hardcore as RMS.
Not at all, it makes a point, ChromeOS, WebOS, Android, are also based on the Linux kernel and hardly considered Linux distributions for everyday use, in a way similar to GNU/Linux expectations. How little do game studios care to port their titles from Android/NDK into SteamOS, even though both are "Linux".
What really makes ChromeOS different from Ubuntu except it is not developed in the open?