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I think it's decentralized partly because itunes doesn't integrate with any other services. So to serve android and IOS many podcasters NEED a single RSS feed that they point iTunes and other services to. Many relatively small services exist to help with hosting, and usually provide a hosted RSS link independent of itunes/whatever. I really hate that many podcasters are trying to push their own app or their publisher…
The biggest thing I was surprised about when I started a podcast is that iTunes doesn't host or distribute podcasts. As an end-user, I thought I was getting iTunes content with podcasts. But in reality it's just an aggregator like reddit or HN: it's full of links, but those links are external and pull content from other places. I was also surprised by how easy (and free) it is to get a podcast on iTunes, especially c…
So this was a case where Apple sort of came along for the ride and didn't see podcasting as being a big deal--which they were sort of right about; arguably even today it's somewhat mainstream but I'd bet the majority of people in the US have never listened to a podcast and certainly don't listen regularly.