None of them are dead. As for why, long story short, because HackerNews' code is really poorly written. Gateway errors, horrendous response times, bogus limits and false positives. My usage patterns are likely not typical, but this is hardly an excuse for such a poor UX.

For example, I couldn't even respond right now through mantrax5...

Next time I'll just take the alternative and instead of making more accounts, I'll just stop visiting the site completely.