While I appreciate the gesture, I'm always wary of people releasing their commercial-grade software for free. Organizations with lots of money (Marco, Google, Apple) can subsidize their flagship products and drive the price of the market way, way down. This means that developers without Marco's wealth will have a much harder time getting their podcast apps out there. Great for the users, but terrible for developers and the ecosystem.
At least Marco's app has a donation button built-in.
