From an ethical perspective, you should be held accountable for not clearly informing users that their data may be used for third-party market analysis. The following points can help you understand this responsibility: 1. **Transparency**: Users have the right to know how their data will be used. If you do not clearly inform users of the potential use of their data in your promotion, this violates the principle of transparency. 2. **User consent**: Users usually choose to use an application based on the purpose it advertises on the surface. If there are other uses behind the scenes, especially involving third-party market analysis, users need to give informed consent. 3. **Privacy**: Users' data privacy should be respected. Concealing the use of data will have an impact on user privacy and may cause users to distrust. 4. **Trust**: Users' trust in the application is based on the public information you provide. If users find that their data is used for purposes that they have not been informed of, this trust will be damaged. 5. **Legal risks**: Although your question mainly involves ethical responsibility, you should also understand that this behavior may raise legal issues. Many countries and regions have laws and regulations on data privacy and protection, such as GDPR (General Data Protection Regulation). From an ethical and legal perspective, ensuring that users fully understand and agree to how their data will be used is not only responsible behavior, but also a necessary measure to protect yourself from potential legal consequences. By handling user data in a transparent and fair manner, you can build better user trust and product reputation.