I wonder if an instance could only allow votes by users who are part of instances that require email verification or some other verification method. I would imagine that would heavily help reduce vote manipulation on that particular instance.
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Wouldn't a detection system be way better? I can see a machine learning model handling this rather well. Correlate the main accounts to their upvoters across all their posts and create a flag if it returns positive. It would be more of a mod tool, really.
I have already ran into a very obvious Russian troll factory account and it really drags down the quality of the place. Freedom of speech shouldn't extend to war criminals and I'd rather leave any clusterfuck that allows it, whether they do it through will or incompetence.
The lack of karma helps some. There's no point in trying to rack up the most points for your account(s), which is a good thing. Why waste time on the lamest internet game when you can engage in conversation with folks on lemmy instead.
It can still be used to artificially pump up an idea. Or used to bury one.
Web of trust is the solution. Show me vote totals that only count people I trust, 90% of people they trust, 81% of people they trust, etc. (0.9 multiplier should be configurable if possible!)
The nice things about the Federated universe is that, yes, you can bulk create user accounts on your own instance - and that server can then be defederated by other servers when it becomes obvious that it's going to create problems.
It's not a perfect fix and as this post demonstrated, is only really effective after a problem has been identified. At least in terms of vote manipulation from across servers, it could act if it, say, detects that 99% of new upvotes are coming from a server created yesterday with 1 post, it could at least flag it for a human to review.