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Because your vote is just as anonymous as your upvote history, which is quite a bit more private than your comment history.

• gus_massa 6y ago
  Until[1] HN is hacked and all the upvotes history is leaked. [1] Assuming there are no intelligence agencies peaking at the traffic and login it on real time.
  • war1025 6y ago
    If you are that level of paranoid then you shouldn't have an HN account to begin with.