1st - Heard from my friend the prc can only withdraw max $65000 USD within a year for overseas regardless his fortune Probably the main reason a lot of millionaire and billionaire migrate 2nd - china big 4 cities has started the inheritance tax whereby those rich people passed away the government will extract x% of their fortunes and the remaining to the deceased family
I do not understand why some people got rich in China, but decided to emigrate to another country and be naturalized. They decided to forsake the root which enabled them to get rich in the first place. These are not the citizens which are grateful to their motherland.
The reason these riches move to oversea is because of taxes, 2nd reason is easy to transfer capital and raise capital from these country. 3rd is high profit margin using Singapore dollars and USD to hedge funds and run the business. In simple language is business friendly country.