Perhaps most authors wouldn't care, but identity validation would gut the concept of the pen name. And as beneficial as pen names are (allowing early women authors to publish books at all, providing an author an out if their name becomes too associated with one genre, protecting authors from fanatics), eliminating them in an attempt to prove whether a tool was used in a books creation is less than ideal.

And worse, I have my doubts that it would even work. See: counterfeiters on Amazon.

That’s not how pen names work in publishing. Source: I’ve published books both under pen name and legal name.