I think the fanfiction could be quite good at explaining to people modern cryptography and anonymity.
Also could examine concepts of personal identity, e.g. if someone converts and changes their name does the note recognise only the birth name or the new one? What about trans people who change names? You could ahve people tactically altering their self conception to avoid the effects of the note...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.