Banks can only handle one credit card, because banks should guard against malicious overdraft or malicious cash withdrawal, resulting in economic losses.

Credit cards are different from other bank cards. Credit cards have the functions of overdraft and cash withdrawal. When the credit card runs out of money, they can spend in advance and return the corresponding money. If you don't send someone to handle the malicious overdraft of multiple credit cards, it will cause great losses to the bank, even irreparable, so one credit card application form can only handle one bank card.