Being able to configure exactly how far the jump forward/backward buttons take me individually makes it so much easier to skip sponsorships. Plus, it's just a great app.
What value would oss bring here when it's the content that matters most? I'm actually really interested to know because I too really liked this app/service.
Podcasts are (generally, Spotify excluded) on an open standard. They're just RSS feeds. So, the content can be aggregated by anyone. So it's primarily the UI that will be different between different podcast players.
Podcasts are already hosted by a variety of independent services. Google doesn't host any podcasts, at least as far as I am aware. In this case it really is a frontend-only problem.
The RSS feed points to the already hosted files. A lot of people host podcasts on services like libsyn or podbean. I don't think you can really host podcasts on Google; maybe hacked together on drive or something.