Audio can be great for conveying emotion versus text (and without the awkwardness of video). It’s also 3-4x faster than typing out comments. I’ve seen stats saying it produces up to 8x more content because of how easy it is to talk vs type (especially on mobile).
Maybe if the posts were transcribed it would help (although that’s expensive at scale, especially for a side project without a clear path to monetization).
Regardless, kudos to the creator for trying something new and fun in such an apparently ‘controversial’ medium.