So the conclusion is that it is better to do KYC at the beginning before gambling at the casino, because there are not a few incidents of people who won big wins then had to KYC but the data was rejected or had a long process, so before facing problems like it is better to do KYC at the beginning, of course in a place that is regulated and has a good license so that we feel safe at their casino, choosing the right casino is also a blessing in such cases.
Casinos are very strict with KYC and when money is now involved before the KYC, they turn to lioness that gave back and doesn't want you to take their baby from them when it's clearly your money is in their hands, they will ask you all sort of crazy things because it's expected of you to have done kyc before depositing money into the casino and do all the required. If you do it in the later date, you will get rejected no matter how many times you try.
Though, there is one casino in this particular forum then, it is called 1xbet, they had a lot of bad complaints about how they lock people accounts and reject kyc and no matter how you try, they will never allow you do KYC and get accepted so they can have your money and left you hanging. Many reports about them were similar and all DT made a conclusion and distrust them in the Forum because of that issue and they refused to clear the backlog of unaccepted accounts.