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Re:Spotify weighed redirecting white noise podcasts to talk ... by danielbarla on Sunday August 20, 2023 @04:33AM (#37197232)
It's not that they were simply smart and didn't de-duplicate identical songs; at some point they simply replaced instances of various recordings of songs with a single one. I could not be further from being an audiophile, yet I still understand the anger this could cause. Even at a basic level, there can be relatively major differences.
Re:Spotify weighed redirecting white noise podcasts to talk ... by threeseed on Sunday August 20, 2023 @07:54AM (#37198263)
I don't think this has anything to do with de-duplication.

It's likely referring to iTunes Match which is a paid service that allowed you to upload your own MP3 files to Apple who would then serve it to you alongside any purchased/streamed music.

I believe that by default (but able to be disabled) your songs would be "upgraded" to the master-quality equivalent in Apple Music if they were identical. But then over time artists have been replacing those song with different versions/mixes.