Joke Collection Website - Public benefit messages - I went to the detention center for a week and received a short message asking for a bank card. What does this mean?

I went to the detention center for a week and received a short message asking for a bank card. What does this mean?

To meet the needs of detainees. The common practice in detention centers is to let the relatives of detainees handle a card (the account holder of the card is a relative) and hand it over to the detainees after registration in the detention center. During the period of detention, detainees can spend money by credit card. After a week in the detention center, they receive a short message asking for a bank card to meet the needs of detainees.