this sentence is not fair because if those criminals created some verified accounts and use then to buy bitcoin. how would OKcoin know they are doing money laundering?
I understand your concerns. However, they point at OKCoin because they offer the platform that allows people to do whatever they want with money that may, or may not be from fair sources. Not sure if this is done with a biased anti Bitcoin motive in the back ground, but it's definitely possible.