Audiobook marketing and podcast marketing doesn’t have to be different from book marketing or any other marketing for that matter.
Maybe it's a personal preference but I'm into the atmosphere. [ https://youtu.be/IInkT6n-NiM ]
Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home...
It's just so easy. It's probably harder to not do it.