Not illegal. According to relevant public information, it is not illegal for companies to use personal mini programs. Mini program users must comply with relevant laws and regulations. Enterprises that use personal mini programs to collect users’ personal information need to comply with relevant privacy policies and laws and regulations, protect the security of users’ personal information, and avoid infringing on users’ privacy rights. Enterprises that use personal mini programs to conduct commercial activities need to comply with relevant commercial laws and regulations, such as consumer rights protection laws, trademark laws, etc., to avoid being suspected of illegal business activities.