I happen to have tried this multiple times. Every now and again I want to erase all trace of me on the internet. HN doesn't allow it. They tell you that you can give a spreadsheet with comment ids and how you want to rephrase things in case you've given TMI about yourself (in order to anonymize). I just don't have the time to go through my entire history to do this. So I attempt to post less, knowing I don't own my comments and I can be tracked

Reddit is actually a lot better in this regard