This amount of money is maybe shockingly big for someone familiar only with low rolls and playing online with fractures of bitcoin. But even in bitcoins gambling the are people for whom it is just not that much. And if cou compare any FIAT monyy casino and all if you check bets in Las Vegas, Reno or some known place like that, people who play there are loosing daily much money than that. Cryptocurrencies casino market is just at an early stage of development as of yet.
According to caesars.com, the biggest bet the Golden Gate ever took was either $125k or $250k (it's really unclear from that page). So it seems unlikely that every fiat money casino has any players who are losing more than $7 million daily.