Those things aren’t private, according to Blizzard, who owns them.
Your real name, address, email address, gender, preference between hot dogs and pork chops, hair color, and current 401k balance, those things are private and will only be out there if you share them. None of those is given away by posting under Character-server or Btags to give you a persistent identity on the forum.
Girl, I’m still waiting for you to answer a lot of my questions that you’ve refused to.
The summary is that human nature is generally, when given anonymity and an audience, to abuse the lack of social consequences by acting out in ways that a person never would if people could tie their behavior to them as a person.