You can name any of them you wish, US, EU, China. They have a common interest that unites them all, governments want monopoly in every country. Look at governments like a group of criminals. In every country, there is a group of criminals that can ruin any rule they want but still get protected by police. Governments and their big (under shadow) supporters want to launder money back and forth, to avoid paying taxes and to control their citizens. So, when these people from the US/EU/China, etc, see that Bitcoin and some altcoins give possibility to average Joe to do things without their involvement, they start to unite for one major thing, to trace transactions and make things visible for them. In the end, they all have their own interest and that might lead to decentralization again but that decentralization will not be a decentralization for average Joe because each government in every country already restricts average Joe. The problem just moved on another level.