Why would you want to avoid being identified, if you gamble legally and if you are not a criminal? Let's discuss the reasons why KYC are not advantageous for the gamblers and casinos?
Simple reason is because I want to play anonymously. It's all about privacy that the platform is not holding any of my private information because it can leak anytime if there's a data breach. The security of data is often a concern.
That's why if possible, I want to play without undergoing identity verification. However, we know nowadays, many casinos are implementing this for the reasons you have stated (to prevent fraud, age verification etc.) and it's a reality that we need to accept if we want to gamble in legitimate casinos since they're just doing it for legal compliance.
At first you wanted to play anonymously, cared about privacy, was worried about data leak, said that you prefer gambling without passing identity verification. But now it looks like you are first in the line to upload your documents to a casino that has good reputation; reputation that was built on gambling experience, not on privacy experience.