Well, for one, most of us have little interest in the new dude to sign up, but apparently a woman with a nice smile lights up the board. For two, most already hide their true image on their avatar from the start. Posting it up on that thread you highlighted is completely voluntary and up to the individual's risk tolerance. Having your actual image as your avatar with your real name is just inviting doxing or stalking, particularly because of point #1. That's not to shift blame on the person who might be doing it innocently, but more to say "just be safe".