So... if we  look just to technical aspect, I'd say this is completely possible, but think about it with me... would casinos really be interested to implementing something that would limit their customers and reduce their own revenue?
Another question: link KYC and the blockchain is interesting, but it comes at a high cost to our privacy... are we going to let casinos further centralize and monitor our data? What would prevent less honest casinos to use this to illegally collect our data?

In practice, I dont think this would work because depends of the cooperation of several platforms. There are so many platforms that many will certainly not join, making it useless and only limiting the revenue of some casinos... this is a very competitive market and adoption would be really low... I think.