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I don't really have anything useful, but in this case, the person doing this blackmail doesn't need to cut it out; but needs to be banned for this anyways.
First off, this is illegal, in pretty much any country there is, in the US, "- shall be fined under this title or imprisoned not more than one year, or both".
Second off, I'm pretty sure that Neus and the team don't to have the capability to deal with the possible consequences or have to deal with the local government /if/ this turns into a government investigation.
I'm pretty sure this has been done, but I'd recommend logging of most in game chat and activities.

If there's anything I can help with, please Pm me.