A lot of gambling sites say "No KYC" in their advertisement or on their webpage but almost all of them will require their gamblers to perform KYC when requested. this is why you need to start making it a hobby to read gambling site's ToS before registering or making a deposit because it is usually written there that gamblers will need to perform KYC when the gambling site requests them.
Yes I have that hobby occasionally. And I sent them the documents they requested. But they are not paying me. So this is more about keeping my money than KYC or no KYC on Justbit...