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I think as long as their rep is at 25 and they have no SP to speak of, they won't be doing damage to anyone. There's a long list of folks, though. Just within the last five days one account hit over 850.

Without juice behind the votes, and a means to increase their SP (posting, commenting, curating, investing), they can't really do much, as far as I know. It's smart not to post or comment, because that leaves them open to flags, but it hampers the SP growing abilities, obviously.

I'm not sure what will happen if they keep doing it at $0.00 downvotes at a time. I wouldn't think it would go anywhere, unless there's another part of the system that we don't know about that throws stuff into chaos. Otherwise, they're pretty much tilting at windmills. :)

I backtracked and saw that I have been downvoted twice by two different accounts. If this keeps on happening, then SP build up will be a lot more harder as it already is.

Well, at $0.00 downvotes, they're not doing anything to the rewards on your posts and comments, nor at reputation 25 are they able to do anything to your reputation. Basically, it's a nuisance, pure and simple.

If they manage to build up the accounts somehow (it won't be through downvoting because there are no rewards for that), then they become a problem. They've not even able to build up their reputations flagging, which means they become vulnerable the moment they post or comment. The best thing they could do is infuse the accounts with an investment. That's really the only option they have right now, since they're not bound to get much through curation with STEEM prices so low.

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