Casinos have some things that they need to take care of, and fighting money laundering and avoiding it to happen within their platforms is probably at the top of their priority list, so they are not wrong in asking for KYC, and if someone fails to pass KYC, they might be the one who is wrong and not the platform.
And with several people complaining about being asked for KYC, it doesn't mean that the casino is suspecting them or the casino is a scam. It is their process that everyone's who's been asked to do, to do it and comply.
How can a casino fail to pass someone who's complying for a KYC? They'll give a reason why you have failed or what you need to comply more for them to pass you.
It's either of the two unless they won't disclose it and that only means that there's something bigger on your end that you have done against them.