Sparkpool still has the same hashrate as Ethermine, how come? Did all the miners in China switch to out of China pool servers?
How about big mining farms in China? If they're forced to close operation, since they're too big to function under the radar, shouldn't there be a big drop in the network hashrate and difficulty?
I believe Sparkpool is closing down its China region at the end of the month. They removed it from their website today.