Yes, from an ethical perspective, you should be held accountable for this lack of transparency. Here are the main reasons: 1. Informed consent and respect for autonomy: Users have the right to know how their data is collected and used. By informing users that their behavior patterns are being used for commercial promotion, you respect their autonomy and enable them to make informed choices. Without transparency, users may be manipulated without knowing it. 2. Integrity and trust: Commercial technologies and products that operate without transparency can easily undermine consumer and public trust in companies. In the long run, concealment may lead to a crisis of trust and negative public relations, and even the risk of legal proceedings. 3. Potential risk of manipulation: Predicting individual behavior and using data to customize advertising may influence or manipulate users' decisions and behaviors. Commercial use without user consent may violate user privacy and harm their interests. 4. The boundary between ethics and law: Although legal provisions vary from region to region, many countries and regions have emphasized the importance of data transparency and user consent. Even if there may be gray areas in law, from an ethical perspective, protecting personal information and respecting user rights are basic principles. Therefore, from a moral and ethical perspective, you should consider how to combine technology applications with transparency, informed consent, and respect for user choice. Ensuring that users understand how their data will be used for commercial promotion is a responsible and more ethically rigorous technology design goal.