Well, this is indeed a very unusual request! A lot of casinos just stick to the basics when you sign up using automated systems to check for fraud.. they're okay with taking some risks at the start and only do a deeper KYC check if something sketchy pops up later. Many casinos keep it simple during sign-up, relying on automated fraud checks. They’re fine with taking some initial risks and only dive into a full KYC check if anything suspicious shows up later. It could also be taken as wasted time as someone mentioned already but then, we all know what they do with the personal data.. your data has a certain value to brokers so its not a waste of time afterall!
In rare cases, a casino might suspect the user’s request is unusual ( in your case, it is unusual! ) or part of a scam, leading them to avoid engaging preemptively in KYC. If i were you OP, i would explain my concerns to them and the reason for my request so they understand it fully and then see what they can do. Try other casinos, pick from a few popular ones. I'm sure someone else can accommodate your request. Good luck!
I agree that it was probably the non-standard request from OP that caused such a strange, to put it mildly, reaction from the support service of this casino. They simply probably have never encountered such requests regarding KYC before.
It's just that in general, among players in gambling games using cryptocurrency payments, a different trend always prevails - no one wants to go through KYC because they are afraid for the safety of personal data, and no one wants to waste their precious time on these checks when it is quite possible to play while remaining an anonymous player.
Many arguments have already been voiced here on the forum many times in favor of the fact that playing in anonymous mode has a lot of advantages. Although, for obvious reasons, it creates some difficulties in the case of large wins.