I don't think you're not gonna find it.

The reason because "Sportbet" is always being targeted for abused and casino need to abused that. Since you're mention "smart-contract" mean that there is no single involved of human touch for the gambling activity.

Since, casino need to maintain and check every player/bet sportbet they cannot do that with smart-contract. Go check a problem from Sportbet with Casino/Slot gambling activity, most of the problem we can find is always sportbet comparing to regular gambling.