That is to say, if you spend one card, you can also pay more cards. The "profit" refers to defrauding a bank's credit to defraud a person's good credit record by paying less interest, which will lead to using a good credit record to defraud a bank of high loans, leading to an increase in the bank's non-performing loan ratio.

Personally, I think it is necessary to analyze it. It's a pity that I have graduated, otherwise I can share it with you.