Most small business in China happens without being taxed. It is fairly trivial to get money into China but harder to get it out of China. From memory, Chinese people can exchange about $10,000 USD per year which is more than the average income here. If you need more than just ask your friend and buy them dinner. (we didn't have enough paperwork to exchange our bonus from RMB to AUD when I left the country. I had two Chinese friends help me since they didn't need any paperwork to exchange money)
The limits are more at a company level than at an individual level.
That being said where would you keep the money as a Chinese national? In the USA where the US government might take it and then throw you in jail when you collect it (Huawei CFO)? Most other countries work with the USA so they are not a lot safer.
The Chinese tax system is mostly "prepaid" so the government gets there tax either way...
This is also exactly what a lot of companies do and you can buy overseas money from these people.