Around 100 million Chinese people travel abroad every year, and they all return to their country of their own free will. You can't even leave North Korea without special permission, which only certain workers get.
I've been to China, and I'm going again this year, I'm from the EU. The funniest thing is that China's Tier 1 cities are more developed than EU cities and offer a better quality of life.
nobody equated china to north korea. the post you are replying to applied equivalent logic to an extreme example (north korea) to show more easily that the logic cannot be correct.