I wonder if it is possible today to publish under a pseudonym that will stand the test of history, given what we know about mass surveillance databases.
No need to even go there. Elena Ferrante got made a few years ago simply by tracking royalties payments. Most lit pseudonyms are broken by simple gossip.
It's just incredibly hard for most people to never breathe a word of something that eats up so much of their mind like writing a book does. Especially when that work begins to recieve acclaim.
Writing has this in common with crime actually. A stunning number of people are made for a crime because they talk about it. Even to the point of many eventual exhiberstions coming when a perpetrator discusses the crime years later, believing themselves out of the woods.
I'm not sure Ferrante is an example of someone trying genuinely to remain anonymous.