A pretty nifty one too: the games are fast because you don't have to wait on blocks, but you don't have to trust the casino (either for custody or randomness) because it's based on state channels.

Yep, they got state channels (branded as fate channels, haha) working even before Ethereum did!

State channels will never be part of the core Ethereum protocol. The idea has always been for projects like that to be built independently on top.