From two decisions of the Supreme Court, the paper analyses the requirements to declare as unfair a term for the use and processing of personal data. The study is made from a consumer law perspective, in particular, article 16 letter g) of the Law 19,496. It concludes that the contravention of good faith and the significant imbalance required by that provision are met when the term authorizes the provider to collect, use and process personal data beyond those required for the execution or performance of the contract, or for purposes far removed from the contractual relationship.