Every account you ever had, every post/comment you ever posted, now has your real name, a photo of you, and your address, all just magically show up on the webpage right next to each of your posts/comments (also, no “hacking” could hide the info). All deleted posts/comments are magically restored and nothing you do (short of permanently shutting down the website and physical destruction of the servers) can delete them. (Any edits would still show every change you made.) How fucked are you?
And don’t think about changing your name, or moving, all this info updates in real time. (for “magic” reason)
(You also cannot delete any future posts.)
There’s a reason why I post under my real name and never delete anything. Because your scenario has a high probability of really happening one way or another. That way I’m more conscious of the stuff I post.
A woman I know had an anonymous blog where she posted stuff about her kids without mentioning any names or showing any photos in an effort to protect them. My wife, who only knows her from her un-anonymised blog found that other blog and recognised her really quickly.
Yup, what people don’t get about online privacy is that it’s not about hiding things, but knowing what is exposed. If you voluntarily expose something on one account that might get tracked back to you.