https://jacquesmattheij.com/the-unofficial-hn-faq/#deleteacc...
I would complain if my pseudonymity were compromised, or if content beyond what I intended to share was being broadcast.
It's true HN doesn't let you delete your account, but I'm not sure most HN account information is really "private", since submissions and comments are all public. Maybe a user's voting history is more sensitive. But it's not like HN (to my knowledge) is aggregating data on its users from other sources.
I was surprised and disappointing when I found out it didn't support deletion, but I'm kind of stuck now. Maybe one day I'll scramble my password and never come back, that's about the closest I can get to a deletion I guess. I check all new websites more carefully these days.