I tend to spend more of my time poking around looking at existing questions/answers on MSE than answering them myself, and recently I found an old question which had two identical answers calculation-wise, with a bit of wording changed. However one was nearly a year older than the other and had amassed a great deal of upvotes, whereas the other had none. Out of curiosity I looked at the newer answer-er's profile, confused as to why they would add an answer that was already there, and found that they have a handful of answers which follow the exact same pattern of copying the math and adding a sentence like "Do this." to an older existing answer long, long after the original answer had been posted.
This (in my opinion) probably isn't exactly an ingenious way of trying to get reputation (and this user doesn't have much) as older answers attract much less voting and I don't see who would upvote a copied answer anyway, but the notion still irks me of blatantly copying someone else's work under your own name.
My question is, does this warrant any more attention than a downvote? Should I inform a moderator? Also, after discovering this pattern I feel the urge to go downvote every single one of their copied answers, however that would sort of match the definition of serial downvoting, wouldn't it?
I don't want to draw a bunch of negative attention to this user and am not even sure if this is technically not allowed, hence I am not going to link their profile in this discussion.