I think it even simpler, tbh. With the proper front-end, you could simply save a blacklist. There would be a market for blacklist, @cheetah would get upvotes to no end for providing curated lists of known spammers, malbots, plagiators, impersonators and trolls, and, depending on severity and heuristics, hide or block their posts automatically so they never take up one second of attention. Problem solved.
Who needs a reputation system if you have such an incentive to behave well?
And no one, under the original Steemit implementation, had the right to limit how and when I vote.
Has your ability to vote been limited in any way?
RE: Negative Voting and Steem