That proposal isn't appealing to someone like JRE because he can't get $100 million per year from decentralized self-hosted podcasts with your suggestion of Bitcoin micropayments. He's mostly mainstream with a few controversial topics. This (mostly acceptable) mix allows him to be on a popular platform like Spotify with the commensurate multi-million dollar contract.

Your decentralized podcast distribution would be more attractive (or simply a last resort) for people who are mostly controversial and de-platformed like Milo Yiannopoulos and Alex Jones.

The above analysis is about comparing strategies & tradeoffs of well-known personalities who are trying to reach big audiences. It's not relevant to other types of podcasters who may prioritize decentralized ideology over audience numbers or lucrative contracts.