Regardless of how much privacy advocates hate kyc policies, but it's still needed to prevent illicit activities such as money laundering.
this is why most licensed gambling sites are requiring kyc from their customers especially if they are exceeding their limits. to maintain their license from the jurisdiction of operations, they will surely apply the kyc procedure. because with their license, and when it comes to audit and they saw big numbers without kyc, for sure their license will be put into question.
Basically let's be clear, the kyc are a Requirement of governments and third Parties to know who are the ones who Play and how much they play, how much money they have available to play, spend and win, in order to have them on a list where in the future it can be used to apply Certain taxes that have not been paid during the Duration of what that person has played,that's the Way I see it, a leak of those Documents and that's it, with that they have so that they have the necessary Information for them to do or extort Someone.