Longer context: At Automattic, we take very seriously the sustainability of the promises we make to users of our products, including serving trillions of free requests to WP.com, Tumblr, Pocket Casts, and many other services over the years.
We want every product to be self-sustaining, so it doesn't rely on my benevolence, but instead has an engine of value creation and capture that can be something we continue to maintain and support for decades to come. We really do think long-term, as evidenced by our 100-year plan on WP.com.
The Pocket Casts business model is similar to that of many other products, featuring a free version with ads and a paid upgrade with additional features and no ads, much like Spotify, YouTube, and others.
As a matter of engineering ethics, I don't believe in "lifetime" purchases, and we don't create new ones at Automattic, but we have honored the legacy people who paid a one-time fee to Pocket Casts when they were a startup with basically what we call a "Champions" account, which is a lifetime you-get-the-best-of-whatever-we-sell deal. There are only a few thousand of these folks, so it seemed better to try and make it more of a gift than attempt to migrate people to what is actually a sustainable business model, which is a recurring subscription.
We open-sourced Pocket Casts after acquiring it because I believe that in the podcasting world, it's vital to have an open-source alternative to proprietary distribution networks.