Ah got it. I wonder if this is a problem at this stage of the site's maturity, or if it can solve itself over time.

When there are thousands of people upvoting good posts, would a bad actor still be able to maintain thousands of trusted accounts to upvote their own stuff?

Your second point about whether or not a user has seen something also makes me wonder whether the problem is temporary or permanent.

Won't content be harder to miss as the site grows larger if users are incentivized to upvote things the community will also find valuable?