China's per capita GDP is less than 1/10 of that of developed countries, and its social welfare system is incomplete, with low security for vulnerable social groups and a large gap between the rich and the poor. Technology is not developed enough. For example, most of Apple is made in China, but the core technology is in the United States. Its patent rights can take away about 70% to 80% of the profits made by Chinese workers working hard to produce without doing anything. %, and the workers’ wages are only superficial after deducting other bits and pieces of expenses. Most of China's current economy is like this, helping people produce and lacking intellectual achievements.
Moreover, people in developed countries have high wages, and the wages of blue-collar workers (technical personnel) do not have to be low compared to white-collar workers. Some international students would rather wash dishes in developed countries than return to their home countries.