I wouldn't be surprised if they're using it, and probably some other videos, as a test for removing dislikes from the site, or possibly for an internal study to see the effect of a video having no dislikes on people choosing to dislike it.
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I wouldn't be surprised if they're using it, and probably some other videos, as a test for removing dislikes from the site, or possibly for an internal study to see the effect of a video having no dislikes on people choosing to dislike it.