We are very sorry that all audio content, including the audio ads, is made and provided by the podcasters, thus we cannot remove such audio ads. 🙁 Castbox does not produce or control any of the audio content of podcasts.

What we could control is the graphical/text picture ads, which cannot be seen in the app by premium users since we are working to keep a clean interface to our users.

Maybe you can contact the podcaster to express your idea about such ads and see if they could help.