Because it doesn't support binding credit cards. Tian Tian Fund Network cannot bind credit cards because it does not support binding credit cards. Tian Tian Fund Network cooperates with ICBC, Agricultural Bank, China Bank, China Construction Bank, Bank of Communications, China Merchants Bank, China CITIC Bank, Shanghai Pudong Development Bank, Industrial Bank, China Everbright Bank, Minsheng Bank, Postal Bank, Shanghai Bank, Ping An Bank and Huaxia Bank, and only the bank cards of these cooperative banks can be bound.