It's normal, non-KYC casinos are being suspected as a scam is normal. Every gambling website before faced that reality before when KYC is not a thing.
Wrong. There are many non-KYC casinos that are completely reliable which is why automatically assuming that they are scams is abnormal.
90% or more people are doing KYC, only few people are not.
Wrong. I have no idea where you got those figures from. Around 60% are comfortable providing KYC while the remaining 40% which includes me aren't comfortable providing their KYC unless absolutely necessary.