Maybe there's some aspect that I don't understand as I'm fairly new to this community, but what if the readers and curators don't mind that the content is also being posted on multiple platforms?
If that was the issue then it would make more sense to just make people aware that the content is not exclusive to Hive and let the reader decide whether they still want to upvote it rather than making the decision for them by canceling out all of their votes.
RE: MIND BLOWING AND SHOCKING ABUSE REVEALED ON THE HIVE BLOCKCHAIN