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.)
Not very much, I assume there’s already some way for my name to be associated with my online identity just due to a slipup at some point or some good social deduction, and I rarely delete things I post anyways (they can be found in the modlog)