Busuu was reported to the Deceptive Design Tip Line over a captcha on its unsubscribe page. According to the report, the company placed a captcha on the unsubscribe page, increasing the amount of work a person must do before they can unsubscribe.
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Busuu: Captcha on unsubscribe page
“This company put a captcha on their unsubscribe page, increasing the amount of work a person must do before they unsubscribe. This dark pattern was posted publicly on Twitter by @Diwann.”