Take note, Casinos will ask or demand a KYC if there's a big winning involved, is this one of their ways to scam their players?
It's somehow debatable because there are other platforms that I personally know of that are not really strict about their KYC procedure as long as you can provide the needed documents to prove that it's you personally who have won the money and of course, if you're eligible to get the massive wins and that you're already old enough to be playing for starters.
Although I also heard some isolated cases that casinos are using KYCs to get away with their responsibilities and has been using that ever since to decline the users of their winnings. I'd say, we've signed up for it and it was our own choice that we chose them and personally, it's already a gamble choosing reliable and reputable casinos because we all know that they are all not the same