Why all the hate towards Craigslist when HN is the same way? Try to delete your account. Better yet, ask PG if he will. Nope. All yer data r belong to them.
What data does HN keep on you? Also I fully agree with non-revocable licenses for discussion forums. Having all of someone's postings disappear because they leave in huff is damaging to the site.
Pot, meet kettle.