allow podcast downloads over mobile, but put in an option to limit it when roaming
Similar to how Google photos app can be set to back up photos over cellular, unless the mobile is on a roaming network. My national data allowance is plenty for syncing podcasts, but I have experienced landing in a foreign country, turning in my mobile and discovering after passing immigration that I've spent $100s downloading podcasts.
Sorry to hear that, but you can turn streaming and download off over data when you're in a foreign country (Settings/Network). That way you can still stream and download over WiFi