Ethics are not a law of nature, it's basically an opinion. Your opinion may be that all business is unethical, but most people disagree.
Most people consider it to be ethical to trade money for goods and services at an agreed price, for example.
Similarly I think most people would agree that hiding the truth from people in order to have them do things they wouldn't do if they knew the truth, is unethical. Tracking people's activity without telling them that you are doing it would be unethical by that standard.
Ethics are not a law of nature, it's basically an opinion. Your opinion may be that all business is unethical, but most people disagree.
Most people consider it to be ethical to trade money for goods and services at an agreed price, for example.
Similarly I think most people would agree that hiding the truth from people in order to have them do things they wouldn't do if they knew the truth, is unethical. Tracking people's activity without telling them that you are doing it would be unethical by that standard.