It's true that some gambling sites require gamblers to submit their KYC when withdrawing big amounts, but there are many other sites that don't require any form of KYC when withdrawing big amounts unless they found something suspicious.
I know some people who withdrew big amounts in this manner and never submitted KYC so far.
In the past that might be the case but I get the impression that more and more sites are asking KYC even if it is not such a large sum that you want to withdraw. I needed to do full KYC when I tried to withdraw 10 mBTC from a major casino site and it is not that I was doing anything suspicious also.
Almost every platform request KYC, but they don't make it mandatory upto certain fund limits. What you've mentioned is small amount, and I suggest you to have a cross check. There will be access to withdraw funds without KYC.
Yeah, it looks like KYC is the norm in Casino nowadays. It is kinda let down for the old users since we are used to lvl 1 to no kyc implementation way back when the casino is just starting but then we can't blame the casino because they are just implementing what the authority required them to do. I think there is no reason to whine if ever the casino that used to be ok with no kyc policy suddenly change to KYC required Casino since we agreed with their TOS that the company has the right to change in parts of the TOS.