I've seen at least one user recently which has all his comments as [dead] automatically and they are pretty normal comments. I did not write down the name but I've seen that only once.
This could be because they got caught in a spam filter, or because we banned them and the comments they've posted since then are better. In such cases we're always happy to take a look and unban the account if they're using HN as intended.
There are some weird edge cases, like sometimes a banned user, once they're unbanned, will revert to posting abusively. Then we ban them again and they revert to posting good comments again. Who can fathom the psyche of homo internetus.
It's also common for an account to post both fine comments and abusive comments. It's the latter that determine whether we have to ban the account—that's how rule enforcement works. But if a banned account posts something good, there's no reason why the good post needs to remain [dead]. This is what vouching is for: https://news.ycombinator.com/newsfaq.html#cvouch.
Thanks, I didn't know about vouching. I guess there's indeed an history behind each ban of a real user. (Not talking about spam of course, it's a different thing)
Sometimes the history is “your account was pretty new so when you posted something a lot of people didn’t like we assumed you were a troll, banned, and never looked again”.
Assuming no violent (as in promoting) or particularly racist/sexist comments in their history, this hits some new accounts if they're using a VPN (some particular VPNs, I guess?). Sometimes they get caught up in the same filters used to block spammers/abusers from using HN. Or if their first (or one of their first) comments was a link without substantial text, that also gets people put into some kind of "spammer" category. You, or they if you tell them, can reach out through the email in the contact link at the bottom to get the ban addressed.
You've found an odd edge-case. baybal2 is banned intentionally, despite the fact that most of his posts are good, and some are great. Unfortunately, the remainder aren't. The compromise is that he's banned, but users like me vouch for many of his good posts to make them visible. Here's a post from Dan about him a couple years ago: https://news.ycombinator.com/item?id=29692791. And another from 4 years ago: https://news.ycombinator.com/item?id=21195898.
We do know to a reasonable degree because otherwise the ‘improperly’ banned would make a noticeable fuss. It’s not a common enough occurrence but maybe you have some in mind.
