I think that's probably the hardest hurdle for a legit new casino. And also probably one of the tools new shady casinos use to keep your money in their platform.
If it's smooth, then people will keep coming back, even if it's new.
What I noticed in old casinos is that they are straight-forward, like you need KYC before withdrawing, and there is no false advertisement just to attract the attention of the gamblers, unlike in the new one where they say that there are no KYC, but the hidden fact is that there are no KYC when signing up, but when withdrawing funds there are. All of us really want smooth transactions like the same how smooth to deposit in their platform
By old casinos, do you mean the ones which have been around for some years by now and are trusted by the community? If so, then you are right. Even if they are not straightforward about the KYC policy, they at least don't say that there is no KYC requirement, and they have it written very clearly in their terms and conditions.
Some of the new casinos might also have it in their terms and conditions but they tend to do false advertisement only to attract new customers and then when the customers find out that they are asking for KYC, they starting creating threads and accusations against them. I recently saw a case like that on the forum.