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.)
Assuming that this would cover all past legal names as well (as I have had a grand total of four, different first and last names): still not a lot.
I have changed a lot since I first started posting things on the web, and I am embarrassed about some of the older stuff that I said before I learned more about certain subjects. But (as far as I can remember), the worst comments I ever made were ones in defence of outlawing abortion, and even those I never posted hate in.
So, given that those few comments are vastly outnumbered by my more recent comments explaining why my previous stance was nonsensical, I would probably have to be more afraid of someone threatening me for being a trans person who advocates for bodily autonomy as a basic and inalienable human right.