Small Worlds was catalogued by the UXP2 Lab over the unsubscribe process in its emails. According to the entry, the prominent large green button does not actually unsubscribe the user from emails; the real unsubscribe link is placed further down.
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Small Worlds: Misleading Unsubscribe.
“The big green button does NOT, in fact, unsubscribe you from emails, the link for that is further down.”