it's simple, they're desperate to reward themselves as much as possible daily so they try really hard to find anything that may be considered abuse and act on it. They're being a disgrace lately and I can't even begin to imagine how many other situations they make shittier for the content creators that I don't happen to check on.
I would have nothing if they had some common sense and decency to not feel the need to maximize daily and think with the hive users best interest in mind but they've shown time and time again that they exaggerate just to self-vote posts, comments, vote-trade, etc for $.
Ohh now i understand their behavior, they have to reward themselves day after day by giving downvotes..but its so weird, they are giving a downvote even if someone have his own content and gave sources etc. Its so sad.