26Directive 93/13 does not go as far as making the system of protection against the use of unfair terms by suppliers or sellers, a system which it introduced for the benefit of consumers, mandatory. Accordingly, where the consumer prefers not to rely on it, that system of protection is not applied (judgment of 3 October 2019, Dziubak, C‑260/18, EU:C:2019:819, paragraph 54).
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