Will anything happen to my prize money? Will the casino refund my money because I never claimed any of the rewards?
At an online casino? usually the value won will be immediately credited to the winner's balance without having to claim it, so you will be able to withdraw the money at any time because the money is already in your account unless the lottery prize is in another form maybe there will be a way to claim it, and actually it would be better for you to read about the lottery rules because the casino will include the rules regarding the lottery that is being held.
If he buys lottery ticket at an online casino then the winning money will always go into the account balance directly and even if he is not active for several months the winning money will still be stored in the account balance without needing to worry about losing it, except for the casino he uses experience bankruptcy or close down, there may be series of problems that will occur in order to get the money.
But if he bought it in land-based casino then the casino manager might consider the prize forfeited, but if the manager at a trusted and popular land-based casino added a large amount of winnings then they would definitely look for him and confirm that the ticket he bought had won the jackpot.
From this it can be concluded that it all depends on where he bought the ticket and the casino will always prioritize customer comfort and trust rather than claiming that the winnings are forfeited.
However when it comes to bonuses, there will always be an expiry time lag in claiming the prize.