Yeah, the steem whitepaper talks about using negative voting as a way of protecting against fraud, but I'm not sure how it applies in this case. Votes are a kind of contribution, but I'm not sure mechanisms are in place to vote on them, which is what you'd need to apply the whitepaper's solution in this case.

I guess you would need to write a bot which effectively downvotes all of @wang's upvotes, because they are presumed to be the votes of a bot. On the other hand, I'm not sure that solution even works as intended, because maybe then the person who owns that bot gets rich.

Not to mention, whoever wrote @wang could write a bot to downvote all of the good bot's downvotes. I'd have to learn the whitepaper more thoroughly to understand how this all shakes out in the end, but overall it doesn't seem like an incredibly promising direction.