Kyc actually has a function to prevent dangerous actions, such as money laundering. In addition, Kyc can also protect customers from account breakers.
Now there are several gambling sites that do not require Kyc to withdraw funds. That's good news. But I don't know if big money withdrawal need Kyc or not. I've never withdrawn much money.
Are you one of those who agree or refuse to fill out kyc on gambling sites? So far, the Kyc that you have filled in on the gambling site is safe? I've never had a problem with the Kyc that I filled out at the gambling site. Have you ever felt cheated from Kyc submitted?
Now there are so many different casinos and gambling services that there are a lot of scam out of them. We can't trust everyone. And by sending them their documents to pass the KYC, no one is immune from the fact that the owners of the service did not steal a copy of it: passport, driver's license. I believe only in big services that have proven their reputation, and I believe that there is no need to look for other services. You will only waste time studying them, and most likely they are a scam.
At the same time, if you have decided for sure that you will upload your documents to the service, then it is better to do it right away. And not during the withdrawal of the first profit, because at this moment the service really likes not to make a positive decision on the KYC.