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The immutability illusion was busted for me when SpaceX edited one of their video live-streams. Their intent was harmless in that they corrected a split-screen that was showing the same camera feed in both windows, IIRC.

However, when you visit that video's youtube page, the video date was listed as something like "Live-streamed on ...", with no note of it being edited. You are given the impression that what you are about to view is what was streamed, when it's not.

The edited version is a better video, but don't tell me I'm watching the same thing as those who saw it live during the stream.