The reason why more than 400,000 yuan can be laundered with a credit card limit of 1,000 yuan is because after adding money to the credit card to increase the credit card overdraft limit, the money can be withdrawn by conducting fictitious transactions with special merchants. This is equivalent to maliciously exploiting a vulnerability in credit card management.

1. Those who commit money laundering will be sentenced to fixed-term imprisonment of not more than five years or criminal detention, and may also be fined not less than 5% but not more than 20% of the amount of money laundered.

2. If the circumstances are serious, the person shall be sentenced to fixed-term imprisonment of not less than five years but not more than ten years, and shall also be fined not less than 5% but not more than 20% of the amount of money laundered.

3. If a unit commits money laundering, the unit shall be fined and the persons directly responsible shall be subject to corresponding penalties.