Secondly, compared with foreign countries, foreign capital is safer and has a very mature field of international investment supervision. The management level of banks is the most advanced at present, and China is learning these technologies and levels to manage the current stock and futures markets.
Thirdly, the funds of domestic banks are not necessarily safe. You can check the recent news that ICBC's customer deposit banker brother took the initiative and the customer securities company traded stocks casually.
Whether the funds are safe or not, it doesn't matter which country you choose.