First of all, casino isn`t interesting in it. They don`t need to care about addicts - they make money and don`t want to pay for decreasing their profit.
That is on them; we are discussing how Blockchain + KYC can improve self-exclusion in preventing gambling addiction. Not whether casinos will accept it or not.

After all, if the regulatory board requires it, they need to follow, if not, then the casino is entitled to their decision

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I agree. It can be some problems with offshores, but it doesn`t our problem.
As i understand, it is true only for UK? And it`s about fiat money? With cryptocurrencies it would be more difficult. I don`t care about KYC but lots of people believe in anonymity in crypto.
It is bad situation as for me. I still think, that for gambler it must be an opportunity but not duty. I would prefer to KYC one more time in new casino i believe, than be KYCed in 200 casinos, that i don`t know.