Just Fab was catalogued by the UXP2 Lab over how a membership is added during purchase. According to the entry, the user can unknowingly sign up for a membership to the site when they buy something, unless they read the fine print in the terms and conditions.
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Just Fab: Membership Upon Purchase.
“The user can unknowingly sign up for a membership to the site when they purchase something unless they read the fine print in the terms and conditions”