Legal analysis: Criminal investigation is mostly frozen for the need of investigation. Generally, cards that have transactions with online gambling platforms are frozen or involve other economic cases. In the investigation of such criminal cases, according to the needs of investigating crimes, public security organs can inquire and freeze the bank cards of criminal suspects in accordance with regulations.

Legal basis: Provisions on Procedures for Handling Criminal Cases by Public Security Organs Article 237 The public security organs may, according to the needs of investigating crimes, inquire about and freeze the criminal suspect's deposits, remittances, securities trading settlement funds, futures deposits and other securities, bonds, stocks, fund shares and other investment rights and interests, and may require the relevant units and individuals to cooperate.