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It is likely not in the definition, but "Spotify-exclusive podcast" sounds a lot like "Chrome-only website".

They are podcasts and websites respectively, they just go against the effective spirit of the medium.

Do they? Podcast, to me, is a talk show on the internet.

The distribution model of podcast has always been peculiar. A podcast is a radio show live or not distributed on the internet.

Its distribution model mimics that of radio shows archives, that for the internet means RSS-like