Actually, it is quite hard to decide because doing KYC is very risky, morever should involve our real identity nationality. Personally, I will prefer to non KYC platform. Because it will not need to think about who we are playing that game or bet in the platform.
About safe or not, it will depend on the platform. Most platforms will tell that they are secure, but we cannot guarantee. Besides, they are real reputable and trusted platforms.
so for those gamblers who prefer not to undergo KYC, why not play in reputable casinos here? a lot of them don't require KYC unless you are a big whale. so before sending large amount of money, make sure that you read their ToS.
on my end, i prefer not to play on a casino that will require KYC before withdrawal. you are already playing in a crypto casino, so why play in a kyc-required casino? it is just the same as you are playing in a fiat-based casino.
in all honesty, i don't feel safe and secure sending my docs to unknown owners. we don't know the people behind in almost all casinos here and what possibly they can do to our data. we are only relying on their built reputation. i prefer not to send my docs as much as possible.