However, do you not reckon that in many occurences when the winner is a new account that has not yet passed all the KYC requirements, the casino should be very careful in giving a very big win without carefully checking all the details of the person?
It is always weird if a new user created an account and shortly later won very big. It looks like that user is an expert in gambling and do know how to make exploitation on the casino.
I am sure if a winner falls into such type, a casino will do seriously consider KYC request before processing withdrawal that should be big.
If it is an old account that has been gambling in the casino for years, there would certainly be a good argument.
That is true on all platforms. If you are a very old user and has very clean history, good reputation, it's a big support for your account and any accusation against you.