I have only had an Amex decades ago, but it was issued when I was too young to drink in the US. Maybe eighteen? Could have been nineteen. Something around that age. The company decided to send me to the US and somebody went "Oh, this kid should have a card so we can sort out expenses that way" and they ordered me an Amex. I never signed anything to my knowledge, just a corporate Amex arrived for me in internal mail.

In fact it wasn't even delivered until after I arrived in the US. At check-in (to the hotel, not the airport) my boss had fax'd them a picture of her Amex card and that was good enough for them. When she flew in a few days later I tried to meet her in the bar, and that's when I found out my first crazy thing about America - I wasn't allowed in the bar.

Very different times. But I'd be surprised if Amex now cares about exactly who the people are its corporate customers want cards for. Why would they? These cards aren't for you to use as personal payment cards, they're your employer's card and you're just authorised to use it for work.