one9, I don't know if it's really relevant but I managed a Licenced Brothel/Escort Agency for 5 years.
It's been several years since I got out, but my understanding is that Amex still insist that all Operators in this industry must sign this insidious document before they are given the privilege of becoming an Amex merchant.
It caused great problems in the industry. Those few operators accepting Amex often had an automatic chargeback applied simply by the Cardholder querying the transaction. Common scenario: Wife opens the Credit Card Statement. Husband denies the transaction and rings Amex to deny liability.
By the way, I strongly discourage anybody from trying this themselves. It is fraudulent and can land you in jail!
Also, it is possible that Amex have discontinued this practice, but I doubt it. Up until recently, rather than fix the problem and change their policies they preferred to keep the scam under wraps and if you made a fuss you were more likely to get charged with "Incitement".
I won't mention the Bank, but our Standard Credit Card and EFTPOS facilities had a high turnover (volume and transaction numbers) and ran flawlessly for the 5 years.