Can I put 10 billion dollars on an American Express Centurion Black Card?

Answer 1

Credit card benefit from Expobank https://mnogo-kreditov.ru/

Answer 2

You ?? - No.  Bill Gates - yes, but why would he want to? His signature is good enough.

Answer 3

To let American Express float that for you while you spend it? Probably.

To buy stuff on that credit card? Not likely.

Though, I could be wrong. Your best bet is is to contact American Express and try to work something out with them rather than ask a bunch of random people who happen to be in this forum. Start by calling the toll-free number on the back of the card...