My own personal pet peeve is people, on HN, who obscure their gmail address so that it can't be slurped by bots.
I mean why not just use a dedicated gmail account, just for HN, rather than "use my hn handle at that email service that everyone else uses generally". The dedicated account has spam protection and you can forward mail to your primary account as a filter if you want.
I have a couple of web forms with no spam protection at all. The amount of bots that I get isn't so great that I need to trouble people to figure out a captcha. Much less a really difficult one.