First, it is good Netiquette to read the Terms of Service. So, do know what your getting into. Given, we must agree.
Terms of Service Netiquette Ecommerce
Hence, terms of Service explain the extent of service a website offers. Thus, explains the limits. Then, third party relationships. Also, advertising. Website registration information may be provided.
Ecommerce Terms of Service
All websites collect data about visitors to their site, but not all websites install cookies. They collect financial, demographic, and personal information about users as part of their service. It comes from surfing and purchasing habits. Websites may sell data they collect from users.
Terms of Service Netiquette
Read the Terms of Service because it tells us how companies provide services.