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There's never been such a policy on HN; you remembered it wrong, as have many before you. It's the same phenomenon as attributes pithy quotes to Einstein and makes Canadians think we have Miranda rights: people hang memories on the nearest pre-existing hook in the brain.

Probably the most that I've written about downvotes on HN is at https://news.ycombinator.com/item?id=9440694.

Does this seem familiar? https://www.reddit.com/wiki/reddiquette

Nope. I've never spend much time on reddit, and I'm certain I've never seen that page before. Perhaps I am thinking of comments other people made on HN in the past (who thought that the policy was as I described).

You're thinking of Reddit.

Nope, I know I'm not thinking of Reddit (as I said in reply to another comment, I've spent almost no time on Reddit, and would not have seen their guidelines at all).

Reddit, we did it again.

No, you did not "do it again". I almost never read anything on Reddit. So that was not the source of confusion.