Steem Mining Queue Dominated by the "Rabbit" Servers

In the past few days, I have noticed that the Steem Mining Queue has been dominated by a series of "rabbit" servers:
http://www.crservers.com/images/steem_mining_queue.JPG

Is this legit?
Or maybe it will require another hard fork like in the case of @supercomputing:
https://steemit.com/steem/@arhag/how-supercomputing-was-able-to-dominate-the-mining-queue-and-how-the-bug-was-fixed

Does anybody know what is going on?
Any insights on this issue will be greatly appreciated.