I can't speak for anyone else, but when I signed up to HN I made the naive mistake of assuming that of course a pure tech website would be implemented correctly.
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.
True account deletion was one of the first features I implemented into my web service. I don't think any non-government site that doesn't offer it has a valid excuse. For example with npmjs.com you have to contact their customer support to delete your account, that's just bad UX.
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.