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Right, we have flags. And this post has been flagged off the front page of HN even with 150 upvotes in less than 2 hours...
It doesn't appear flagged to me.

Remember that HN downranks posts with certain ratios of comments to upvotes, or with a certain level of activity - I'm not sure exactly how it works - to prevent flamewars. Whether this is a good measure is up to debate, but all articles get the same treatment if they hit these thresholds.

So HN isn't included in the "wherever it gets posted on the internet" since it's implied that "wherever" needs downvote capabilities. Doesn't make the sentence any less true - you just read too much into it.