It just means he has a huge advantage over miners who arent using an exploit, so he gets most of the rewards. The total amount of mining rewards is unaffected and even if the miner is malicious (which we don't know) there isn't really anything he can do to harm the system. He just gets a bit of extra rewards, but even that isn't a huge amount. It is equivalent to what one of the top 19 witnesses gets, and when it comes down to it, he's doing the same thing (signing blocks).
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