Well, that is something that is very good and that also speaks highly of you for your work in giving and providing everything related to KYC, it is something that not everyone does, some prefer to leave that balance there without moving it, just to preserve anonymity, Regarding what you say, KYC is already something very normal for me, most of all casinos, the first thing they do is ask for KYC
It is inconvenience and it is a very first feeling for people. However, it they really want to use that service because of its top-notch services, quality and other reasons, they will accept KYC requirement.
The point is they must have reasons to to this: reason to use that service, reason to trust that platform will protect their personal documents safely enough. Trust or not, when you submit your document to a third party platform, it's no longer fully controlled by yourself.
I cannot deny that sometimes it is complicated for me, because I have to live in a country that it is not mine to get certain documents, people are very jealous with their documents and think that as a migrant they will cheat.
KYC should be done with your own identity documents, not a bought or borrowed one. Because later platforms might require to you verify your identity again by a suspicious login, game play or withdrawal. If you bought or borrowed documents, I am sure you will be in big trouble in such situation.