Removal of Content By YouTube
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Which begs the question, what reason did they give you. If they didnt, then it falls under one of those three categories. The cops are after you. You are being investigated. Or giving you the reason would hurt other people.
edit: I was just curious so checked out XI's ToS again. There is this part. We all agreed to it.
"You agree, through your use of this service, that you will not use this bulletin board to post any material which is knowingly false"
Then again, a great many people truly believe the lies they post/repost.