Building an MVP is like packing - you leave out half of the stuff you want and double the money. My scope ended up bigger than I hoped, but I still managed to ship in just a couple of months since the first product mockups were created.
Our USP is allowing episodes to "drip" out rather than be date released. We also allowed episodes to "expire" so there is urgency to listen. Installing the private podcast was just one button. And adding your listeners was automatic. These features were essential for those early adapters.