Podcasts are decentralized already. The feed is still there, just not in Apple’s opt-in index any longer.
Just goes to show if you are doing anything remotely controversial do not build in Apple's ecosystem and most definitely do not invest in development of software that relies on being distributed in said ecosystem. If they ban a podcast or an app for hatespeech or wrongthink (under their 'definition' or on the basis of a hyped up PR campaign from a well funded political opponent perhaps) they can ban you for anything on a whim.