That's when a company captures an audience in a walled garden and then extracts value from creators who want to reach them, even when the audience *requests* a creator's work. With Spotify, that manifests as #payola, where creators have to pay for inclusion on playlists. Spotify uses playlists to manipulate audiences into listening to soundalikes, silently replacing the ambient artists that listeners tune in to hear with work-for-hire musicians who don't get royalties.
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Facebook's payola works much the same: when you publish a post on Facebook, you have to pay to boost it if you want it to reach the people who follow you - that is, the people who signed up to see what you post. Facebook may claim that it does this to keep its users' feeds "uncluttered" but that's a very thin pretense. Though you follow friends and family on Facebook, your feed is weighted to accounts willing to cough up the payola to reach you.
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