I have no idea who that is

I know exactly who this is, even without the username tip-off. Here’s what their record looked like in September:

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I happened across the user when looking into a string of -1’s on brand new posts in a small community. They were all the same person, and that person downvoted 244 times for each upvote.

This on its own is not normal behavior. Combine it with this user’s comments - which are pretty much completely on brand for the average Lemmy user - and it becomes even more bizarre.