This practice is likely to cause serious ethical controversy. The following points can help understand this issue: 1. User autonomy and informed consent: If the algorithm changes the interface or recommendation mechanism without informing the user in order to increase sales, it may interfere with the user's decision-making based on sufficient information. Users are affected without knowing it, which may violate the basic ethical principles of informed consent and respect for autonomy. 2. Misleading and manipulation risks: When designing and using such algorithms, if the changes in the system appear natural and objective to the user, but there is actually manipulation of commercial goals behind it, then this may constitute misleading to the user. This implicit manipulation may interfere with the user's judgment on product selection, thereby undermining their trust. 3. The issue of moral responsibility: Although the use of algorithms to optimize sales is regarded as part of market competition in some business environments, if this practice is at the expense of the user's right to know and autonomous decision-making, designers and companies should bear certain moral responsibilities. From an ethical perspective, when a system design deliberately exploits the user's psychological characteristics or decision-making loopholes to achieve commercial goals, the relevant parties need to seriously consider the potential negative consequences. 4. Industry norms and laws and regulations: In addition to ethical issues, some countries and regions have legal provisions on data transparency, algorithm accountability and consumer protection. If the algorithm does not clearly inform the user and produces misleading effects, there may also be legal risks. Relevant laws, regulations and industry guidelines must be followed during design and implementation. In summary, if sales are increased through algorithm optimization strategies without informing the user, this behavior may mislead the user and affect their autonomous decision. From an ethical and possible legal perspective, designers and implementers should bear corresponding moral responsibilities. Transparency, respect for user autonomy and the right to know should be important considerations in designing commercial algorithms.