Exactly. If it's news to people then they clearly had some expectation. But I think it's easy to fool yourself into thinking this isn't true post hoc knowing an

Exactly. If it's news to people then they clearly had some expectation. But I think it's easy to fool yourself into thinking this isn't true post hoc knowing and especially if you're someone who visits HN and is more keen on the details. I think it's also worth noting that most people don't want this to happen even when they do know. Of course some people don't care but even they do when they learn how it's being used