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https://github.com/minimaxir/hacker-news-undocumented

Normally most users can vouch for flagged submissions. The fact that this is non-vouchable is interesting.

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Could it be that people who have commented in a flagged post are forbidden from vouching?
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That's my suspicion. Likely with an IP association as well for people with alt-accounts.
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The link you posted says users can only vouch for dead submissions, though?
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