How would you feel about the existence of a website where I could paste into it a text box any Hacker News username, and it would reply with an accurate estimat

How would you feel about the existence of a website where I could paste into it a text box any Hacker News username, and it would reply with an accurate estimate of the job history, location history, political opinions expressed, net worth, age, marital/family status, other websites/forums frequented and usernames on those sites, etc. of that user? How would you feel if a browser plugin displayed these details next to every username on Hacker News?