I agree with your point. A lot of players assume that No KYC means they will never be asked for verification, but thats not always how casinos define it. The problem is the lack of clear communication. If a casino reserves the right to request documents later due to security checks or large withdrawals, they should state that in the beginning. Being transparent about when and why KYC might be required would prevent misunderstandings and help players know exactly what they are signing up for.
Nokyc should mean Nokyc and not the casino having another meaning to it. Any casino that says they are KYC free but asks for KYC is fraud. They are using misinformation to market their brand and, as a player, you also need to check if what they preach is the same thing that they have on their Top before you start patronizing them, and we have to work with what's on the rules because that's what stands than what we were told during marketing.
At some points you are on point the KYC should not be something that would disclose any of your information to any casino, like you said any casino which was not asking for KYC at first time of registration and is later now asking for KYC maybe when you are about to withdraw should be tag as a scam casino, and I think very common in most of some casinos when you are about make big withdrawal of funds and then they might use KYC issues to deny you access to the funds, and also very important as a player to always check their TOS to check what they are preaching…