The guy did complete the registration. If he wants to complain about the design of the site and the fact that it's unclear why they want certain information, th

The guy did complete the registration. If he wants to complain about the design of the site and the fact that it's unclear why they want certain information, that's legitimate because it actually could be an impediment to people signing up, despite your disapproval. Is it appropriate on HN comments instead of actually sending an email to the guys who run the website? Probably not.