The odds in lotteries are very small that's why it has a very high jackpot amount, I doubt if it's possible to win a such jackpot in any online gambling site/ sports betting. Only a few people are lucky enough to hit a jackpot in lotteries and there are over thousands or even millions betting in lotteries.
I definitely agree with your, winning such an amount from online gambling or sports betting is indeed impossible, reason being that, like I've learnt here, there's a limit to the maximum amount of money a gambler can win, online casinos must have put this measures in place to make sure no gambler wins an amount of money they won't be able to pay, because such a thing would not only ruin their business, but it's also very shameful..