I've seen that happen before with mass-flagging campaigns. What it appears like is that, since @YouTube can't be bothered to actually vet any flags, they just remove it once it reaches a certain threshold. Obviously, since their processes are opaque as hell, no one knows.
Thanks for reaching out. If you believe your video was taken down in error, you can appeal. Our Help Center explains how: https://goo.gl/Gks8WR . Hope this helps.
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