that is a really frequent discussion in this topic
it comes and goes but it's often here
most of the times the comment is: KYC is useless but the house makes its rules and if you want to play you have to abide by them.
simple as that
This is a never ending discussion in many topics. I wouldn’t say that KYC is always useless as in some cases I can get why casinos want to check it (especially if you want to withdraw a big amount). But a lot of casinos are trending to asking KYC so we just need to adapt and live it.
Nowadays it's not surprising for casinos to require their customers to verify their identity. But still, many gamblers are hesitant to undergo this procedure since they don't want to disclose their private informations and that is understandable.
However, it's inevitable if you're playing in a regulated casino and lucky to win a huge amount. Therefore this should not be an issue especially if you read the ToS of the casino, it's written on it (if you take time to read their rules).