Adam Curry seems to have coined it. He pushed out a bunch of RSS extensions in recent years and called it "Podcasting 2.0" but they are very "we had a podcastin

Adam Curry seems to have coined it. He pushed out a bunch of RSS extensions in recent years and called it "Podcasting 2.0" but they are very "we had a podcasting wishlist and wrote a spec" and not very "we wanted to make something with a high chance of adoption". 99% or more of podcast listens are made through an app which supports zero "Podcasting 2.0" features, and listeners are not clamoring for the ability to use them.