Besides the factor that there are no (online) casinos that allow such high bets, the number of people who could place such bets in the first place is also extremely small.
Some online casinos do allow such big bets though such stuff is done privately through various secure channels based on what I heard. They allow them to gamble secretly in order to protect their identities.
However, I am sure that there are traditional offline casinos that are reserved for very wealthy customers and where such bets are quite common. However, they wouldn't have a problem with such high losses either.
Yeah. This reminds me of the crazy high-stakes games from the Bond series where elites wagered money.