Sneaking or preselection
Sneaking or preselection is a deceptive pattern where additional items or options are automatically added to users' baskets or preselected during the purchase process. This tactic relies on users not noticing these extras, leading them to make unintended purchases. For example, imagine a subscription box service that preselects add-ons like a bonus item or gift wrap. These options are included by default, and users need to actively deselect them. If users are in a hurry or not paying close attention, they might proceed with the extras, increasing their total cost.
These sneaking tactics can frustrate users and erode trust, as they feel tricked into paying more than they intended.

