1. The sexual abuse story is unrelated to your app and feels like you're trying to guilt the customer into using it. The best way to support victims would be to donate directly to the NGO not use your app, and therefore this story seems like a disingenuous marketing strategy.
2. The problem with audio only social network is there's no way to "skim" things. There's no guarantee that the audio story a user clicks on will be interesting, and by the time the user figures out its not, you've just wasted 60s of his life and he's angry and wants to delete your app.