You said in the release notes that this was about server load, but now it's about people voting too much for your tastes? 14K unique people cast at least one vote in the past day, I really doubt 10 people are having a great impact on the rankings. And if you think people are bots manipulating the rankings, then wouldn't it be better to bring it up in the admin chats so they get banned?
Also, what's the methodology you've used there? You say the top voter has 23K votes, but from feddit.uk's data the top voter is at 19K, who happens to be a p.s user mind you.
My 241st vote when it realises it's going to a piefed instance: