From what I have observed, the casino[1] that has been mentioned now currently exists in web 2.0 which is
here. Eventually, they are also planning to build another version of their casino in Metaverse, particularly in Sandbox, Decentraland, and Metachance under the
Ethereum blockchain[1]
https://luckydegens.com/Metaverse includes so many things and social interactions via casinos is one of ways for entertainment. With the growth of Metaverse and blockchain, it is more easily for people, exclusively gamblers to bet on multiple chains, swap their money cross chains and with very little waiting time. On some chains, cheap transaction fee too.
Casinos on Metaverse likely are more addictive than really physical casinos because gamblers don't have to go to anywhere. They just stay at home, have good Internet connections, accounts and NFTs to bet 24/7
So yeah, I think the implementation of NFT in blackjack.fun would be quite cumbersome especially now that there is a pending version update on the website. It isn't a bad idea either because you see, there is a lot of space for improvements.
BlackJack.fun has years on the forum and has good reputation. If they can improve their services with current games and deploy more products, their casino will become more attractive and bigger. Metaverse and NFT are the trend in coming years.