I agree. I "revived" the comment by clicking on the timestamp ("33 minutes ago") and then clicking "vouch". I believe only users with a score of 200+ (points? karma?) can do so.

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kryogen1c a day ago | parent | next [-]

Been here 8 years, always wondered how comments died. I assumed it was algorithmic. TIL

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throwup238 a day ago | parent [-]

“[dead]” usually means algorithmic (could be as simple as an account registered via Tor that hasn’t been vouched for enough times). “[flagged][dead]” usually means it was flag-killed by users, except I’ve been noticing some AI written comments that are flagged instead of just dead, but they’re minutes old so unlikely to be user flagged.

	▲	defrost a day ago \| parent [-]
		There's been an "AI comment detect" algo trialed and running for a month or so now. If you see any probably human comments tagged as Mr Roboto either vouch (weak indication, needs a few others to boost) or email hn@<this site> for dang / tom to cast a meat based eyeball over it.

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flexagoon 18 hours ago | parent | prev [-]

Does the account registration date also matter? I have 2110 points and I dont think I have the vouch button