That some people don't fully grasp KYC is a valid point. But I feel compelled to add that sniffing out wrongdoing is only part of the story. It's a rule that needs to be followed so that crimes like identity theft and financial fraud don't happen. It has nothing to do with how large or small a gambler you are and is instead a measure taken to maintain trustworthiness and openness in the online gambling system.
While most of us believe that a casino that operates under a license tends to be more safe and secure for us and our assets, this small group of people think that a casino that has a license and asks for KYC verification is going against their privacy, like they are the only ones being asked for it.
KYC cannot be avoided even though it is contrary to the wishes of anonymity because the average gambling platform has implemented it, except maybe a gambling platform that does not have a license, that is possible, but it is not safe for you to gamble.
And it seems that this policy is indeed based on the rise of gambling activities that are misused, and including gambling using crypto which is experiencing increasing adoption.