This is where things can get exciting with your book as a podcast as opposed to (or in addition to) an audiobook.
But they listen to podcasts and audiobooks. [ https://youtu.be/oyLdzCm0ZcE ] https://youtu.be/63g0iIyAQLk
If you have a podcast, you have some, well, power, authority, credibility. Just like if you have a book, you instantly have some leverage...
Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home...