1. Depends on the winning limit. But responding to that question directly, yes it's possible. In sports betting, if really eager to push on that huge winning, a parlay with huge odds will do. But as I said, there's only a winning limit depending on the bookies. The same goes for online gambling. There are top winners' records on a specific slot game if that's available on your preferred casino site.

2. Crypto? Fiat? In fiat, I'm sure there is. In crypto, maybe freebitco.in lottery or we can consider also their Lamborghini lottery. But don't expect there are lots of crypto-gambling sites offering a lottery.