The Staples Amex offer would appear on all business cards, as well as all personal cards through the /domorebusiness URL back in June, which was a URL Amex advertised in emails. You could have had 10 cards with them -- maybe 5 personal credit cards and 5 charge cards between personal and business variants, and added the offer on all of them, without any multi-tab trick if done in June. There was no need to make phony authorized users with the same SSN, as you can add the same individual as an AU to all 10 of your cards and they could add the offer there too. Amex did a terrible job if they really wanted to limit it to one per person. This would be like Office Depot clawing back all the people who got extra money off on MasterCard gift cards last week.