i know crypto lottery on pancakebunny, pancakeswap and moonpot by beefy you can check them out i tried moonpot its actually win win lottery sytem so you will not lose your money when your not the winner 
using chainlink vrf maybe this was fair enough
using chainlink vrf maybe this was fair enoughI played a lottery game on pancake, and the last trader was the winner. Without a doubt, I lost again.