Does pointing that out advance the discussion in a useful way? Does it help having a constructive debate? Does it make anyone's day or life better? Are you just posting in the hope of getting some upvotes for making a funny, snarky short comment? Is your comment actually relevant to the discussion? Does the fact that you ask that question indicate that you already know the answer?
I did not write that from my Lemote, channeling Stallman, nor I have any general enmity towards closed source software (that I both use and write).
I just don't like inaccurate proclamations of purity.