I'm currently building an audiobook app. I've considered adding podcast (and even music) support, but wonder if this is something people actually want bundled together or would prefer tailored experiences.
I wouldn't want them bundled together. Focus on one thing - when I want to listen to an audio book I'm not after a podcast or music. I have other apps for that.
It's still really early and I'm currently using some AGPL libraries which means I can't distribute without also being AGPL. I haven't been able to find a good way to make money on an app while releasing it open source. Would love to figure out a way to do both.