So Two Questions..
1. Do you think its possible to win such an amount of money in online gambling/Sports betting ?
(my own opinion: I don't think its possible, as I've never seen.
The big question can the casino pay billions of dollars to the winner, I think there is a limit on the amount a player can withdraw, there's a big difference when it comes to what they can allow on online casinos and on offline casinos it depends if the casino can keep up.
2. Is there any online lottery casino available where it is possible to win such as enormous amount of money? Please share ..
Yes here in our country our lottery which is a government-run can payout large amounts of money as long as the jackpot is not being hit it will just carry over, lotteries here in our country can do that because its government-run, and it's well organized and audited so they have no reason not to decline winners of their winnings.
I will also say it all depends on the country involved, but to be more precise we need to be more accurate with the kind of lottery that can offer up to this range because the money involved are enormously big, most if the government backed lottery perfectly work out well on this and it has to be an offline kind of lottery because the amount involved maybe impossible to be transferred to the winner's account except in cash of which I think is also risky.