I think it is centralized with the possibility of decentralization if the centralization becomes too obvious. So Bitcoin can use original fears to reinforce what should happen. Then I want to know what you think about this, as if BTC is centered, it's likely to cause its value down, and most importantly do not violate the principles created. Unless there is a way to compete with the advantages miners like cheap electricity, ASIC results produced in the same country and many investors, I doubt anyone can beat miners chinise in mining.