Yes, and a few rare users do that.
However, I don't know that users that don't do it are 100% against being contacted by other HN users.
It's possible they're just hiding their email to prevent the usual marketing spam (my own position).
However, I don't know that users that don't do it are 100% against being contacted by other HN users.
It's possible they're just hiding their email to prevent the usual marketing spam (my own position).
Anyone on HN can opt-in and does not require administration by the HN moderators. Or additional development effort by HN programmers.
Good luck.