When you are able to log in, you then see who are related to you as well. I believe the news sites use those inflated numbers to make it more dramatic.
It's better for the world that that kind of aggregate data is public where anyone can use it, rather than exploited by 23andMe or sold only through data brokers.
I would bet that an overwhelming majority of 23 and me users do so under their real names.
I would bet that an overwhelming majority of HN users who use 23 and me do not do so under their real names.