You can consider it as a scam if it did something that is against the law or that is really inappropriate for instance you just won a big amount of money and they will do anything to delay it or in case won't allow you to withdraw and you submitted the required document but still, they did not accept it even though you know that what you have send is valid and doesn't have any problem.
I think you should away on those kind of gambling site.
Even though the ops stated clearly that he didn't know that the casino will ask for kyc but after he won an amount that is above many casino trence hold for kyc demand, because most of the casino may allow you to withdraw any amount that is below $5k but any winning above that limit will trigger kyc demand and the player will need to go through kyc verifications.
But in a situation where the player passed all the verification process and the casino refused to grant him access to the fund then he can call the scam.
Casino sites may require kyc to withdraw large amounts which almost all sites require. But all sites must write this into their rules. op said in his post that he is willing to do kyc but he submitted kyc but his kyc is not getting approved. If the site is repeatedly rejected by kyc despite submitting the correct information, then the site must be trying to cheat, so the site can be called a scam. But op has not posted any proper proof that his kyc was rejected after submitting kyc