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my guess is that they are bots, and someone is trying to manipulate the earnings for those accs (trying to add value when upvoting)

Yes they are mostly bots and people who have made posts that look like bots that have garnered them a similar reputation.

So they are trying to help out the writer?

well, not exacly... they are trying to exploit posts so they can earn some SP if whales upvote it...

Thanks for your good posts, I followed you!

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Thank you so much for proving my point.