I have never won a Jackpot, it is my dream. However, I have won sport betting on some last match of WorldCup 2018 and earn up 5 BTC. It is a huge gain ever. 
Wow that's a great deal 5 bitcoin from world cup that's sweet. It's not a jackpot but for most here that's already a jackpot and I've never won that amount with my entire gambling career.