Book subtitles are getting ridiculously long. What is going on?

Some authors can’t even remember their own titles.
Read more: https://www.washingtonpost.com/entertainment/books/book-subtitles-are-getting-ridiculously-long-what-is-going-on/2019/06/04/3150bcc8-86c3-11e9-98c1-e945ae5db8fb_story.html?source=Snapzu