KYC is not major concern now so for sure anyone knows about this implementation. If anyone still doesn't like it maybe they will just go temporarily on not reputable casino but later on once they realize which this is normally happen when they compare the service provided and the risk they came back then accept this KYC ask to them.
Its normal for people to get afraid about sending their private details to online platforms but once they know how reputable the casino they submit it without any further more questions.
I am not sure if it is still "normal" to feel fear when sending that. I understand that some people might, but if you have been in the crypto world long enough then you have shared your information already to multiple places. There are 5 to 6 places that already have my KYC and I am not worried about it at all.
Plus, this place doesn't want as much information as people think, it is very minimal situation and that means you would have to provide proof and all that later on if anything happens of course but at the start it is not really that much. I know that we are moving towards a bit more decentralized market and that is why people would like to avoid this, we even started to have decentralized casinos for a while, didn't work well, but those people could start going towards that way.
what most paranoid people can do is submitting different addresses if they have access to more than one address proof,
lots of articles on how KYC is more of a burden than a solution but we talked a lot about it here already.