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PSA: Lemmy votes can be manipulated
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this post was submitted on 09 Jul 2023
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How do you differentiate between a small instance where 10 votes would already be suspicious vs a large instance such as lemmy.world, where 10 would be normal?
I don't think instances publish how many users they have and it's not reliable anyway, since you can easily fudge those numbers.
10 votes within a minute of each other is probably normal. 10 votes all at once, or microseconds of each other, is statistically less likely to happen.
I won't pretend to be an expert on the subject, but it seems like it's mathematically possible to set some kind of threshold? If a set percent of users from an instance are all interacting microseconds from each other on one post locally, that ought to trigger a flag.
Not all instances advertise their user counts accurately, but they're nevertheless reflected through a NodeInfo endpoint.
Surely the bot server can just set up a random delay between upvotes to circumvent that sort of detection