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Could be that, or pushing a certain interest-idea-product-business? Or vote-payout manipulation. I'm far too new and uneducated in steem (today is day 44 only for me!) to say. :)

One simple answer - selling accounts. Creating lot of traffic in making them for free, so everyone is waiting long and I can offer selling them.

Second - every account gets delegation of 15SP. Take couple of hundreds of them, implement a script, and upvote one specific user to get money of reward poll.

Those are from the top of my head...

damn... makes sense

Here I've put some more examples of abuse.