[ChancyChance]

You don't use your real name, you go by SoftTalker.

I run stylometrics on your HN posts, then on every document archived by a data broker, including highschool/college papers. I identify you. I can then use that information to extort, harass, or rob you. At scale, anyone who buys this data can do this to tens of thousands of people with scripting. DefCon has had some nice presentations in the past about software that takes this data as input, and generates harassment scripts -- practically as SCRUM tickets -- to do this at scale.

Still think privacy / private data doesn't matter?