1. User reports: Some consumers may find that Doudian has no supply, or buy fakes, inferior products, etc. They can report the problem to the Douyin platform through the reporting function. The platform will investigate and verify the report.

2. Platform inspections: The Douyin platform will regularly inspect and review stores, and stores with problems will be removed or restricted.

3. User reviews and complaints: If Doudian has no supply, users often express dissatisfaction in store reviews or complaints. The platform will handle it according to user feedback and complaints.

4. Data analysis and algorithm detection: The Douyin platform uses algorithms and data analysis to detect abnormal behavior and non-compliant stores. By analyzing store data, the platform can identify stores without supply.

Once Doudian is found to have no supply, the Douyin platform will take corresponding measures, such as punishing stores, restricting or closing stores, etc., to protect user rights and maintain the reputation of the platform.