Yes, 1win India is legal in India. The platform operates under a valid license and complies with the regulations set by the regulatory authorities.
The largest jackpot of all time was a $23.6m bonanza (around 19m) landed by one player from Belgium back in 2024. They were playing the Absolutely Mad variant of Mega Moolah, and no doubt the individual was going bananas when they realised the extent of their win.