I imagine what goes on here in the West is peanuts, not significant to what the official servers are making. Private server scene is like combing orchards for apples left behind after the owner got the main portion of them and his customers would not want those apples left behind anyway.
Private server scene is always behind, scavenging, while the development is already somewhere else. What goes on here in the West is not competing with their games run in the East, prosecution would be at best problematic, they are pragmatic about it. Even private servers in China, Korea get away with it, unless maybe being too visible, raking in too much money.
Suppose you take down place like this here or that Revenge server , you won't gain paying customers on your servers somewhere on the other side of the world or recover some significant money you could sue the server owner for.
I understand that someone new thinking of putting a server online would have jitters. Maybe research how pple run servers in China if that is where you are. Out here in the West, if you are in Egypt or even Romania, you run much less risk than if you were in UK, for example, if there is a risk to begin with.