SketchUp was catalogued by the UXP2 Lab over the process of unsubscribing from its email list. According to the entry, unsubscribing requires the user to click an unlabeled button.
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SketchUp: Unlabeled Unsubscribe Button.
“Unsubscribing from email list requires clicking an unlabeled button.”
Disclaimer: examples in the Hall of Shame are generally drawn from public submissions and cited sources; they have not been independently verified and may contain inaccuracies. They are presented as illustrations of design patterns, not findings of fact, unlawful conduct, or intent.