It's completely useless because NFTs have to have their own casino identity what's the point of adding NFT if it's made by other developers of course they lose their identity just look at the other casinos they made themselves. The question is how NFT is used in the game or just as a reward.
I was curious on that too since the NFT they promote on their website is from third party and not their own themed NFT so I think right now they are giving it as an airdrop? but maybe the SandboxCasino.io would think of something on how this NFT will be useful in their gambling site.
ya.ya.yo!