I think the other place tried to solve this by weighing a certain number of votes up or down.

So if a post got 10 upvotes, the 11th would weigh less in the algorithm, meaning that it was harder to burry something that was already perceived as upvotable. If a post of comment got 5 downvotes, the 6th etc would “weigh” less in the algorithm making it harder to bury posts just by downvoting them. They also labeled posts as things like “controversial”, “popular” etc.

I don’t know that this is a solution, in part because our “algorithm” doesn’t really function on a karma system, and in part because I don’t have the kind of knowledge it takes to understand the finer details of how this arm of the fediverse works under the hood.

But I do like the idea of limiting the number of downvotes an account can make per day, and also perhaps automodding accounts that do upvotes or downvotes an a rate that a human user couldn’t.