Fun fact that many people might not realize is that the up/down votes you make on lemmy are not anonymous. If you pull up a thread on kbin for instance, it will list everybody that has voted on a post. Also, if you are an admin on a lemmy instance that federates with the community, you can see all the votes. I run a test instance of lemmy that is federated with this community that I used for rikka testing. That also allows me to see all the votes. So, after a quick photoshop to protect the innocent, here is what that box looks like (the first page anyway):
Some people just pretty consistently downvote any anime content they see in their all feed. That’s fine, they are allowed to do that. I would only step in with bans if I saw a bunch of accounts that likely belonged to one person trying to manipulate votes.