In that post Vitalik actually says he thinks there's a high chance block production will end up centralized. If it happens, what's to stop the government from g

In that post Vitalik actually says he thinks there's a high chance block production will end up centralized. If it happens, what's to stop the government from going to the dominant block producers and forcing them to impose limits on the kind of data a block can store? Then dragging them to court or enacting some other form of political retribution if they fail to do so.