But what if you could get the original text cancelled? No right-thinking publisher would print it, no God-fearing bookseller would stock it, no teacher who valued their career would add the unsanitized version to their school library, and they would buy your annotated version instead.

I suppose someone could create a second censored version, but if the changes they made were too close to the current publisher's, they might lose a copyright case on that. So all the publisher has to do is keep up with the mores of the time on what must and must not be airbrushed out.