Additionally, GNOME is just a DE, not an OS and so should be removed from your list so people don't get confused.
It's also worth making the distinction that while all of those distros mentioned are free as in "free beer", none of them are free as in freedom. Ubuntu and SteamOS are particularly egregious in violating the freedom of their users.
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drm in general is bad and is always a form of spyware, just an FYI.
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You don't need to convince me.