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Today i installed arch linux for the first time rule
(pawb.social)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Here we go.
Who are you to decide what does and does not belong on Linux?
I think what they were specifying was the role GNU plays in that sentence. Personally I don't like calling one GNU/Linux and the other Linux, but the defining point of GNU is that it's uses only free open source software, and does not contain any non-free (as in speech, not beer) software.
GNU preaches free software. Steam is nonfree. I think they're just trying to point that out.