Who is ZgDyGeJJhmXwSroPasbTg3PVY9ohHUT8Xo

They have a GPU miner. They May be responsible for 10-13 mh/s over the past week. They are dominating the whole network at will. Is this a serious problem that they are able to dominate the network?
We can't say for sure it's a GPU miner but it is possible since our code is open sourced. The other possibility is a CPU farm, not much can be done against it.