If you could do KYC process before making a deposit, would you do it?
For me as a customer, yes. It's fine as long as I am aware and confident that the data is safe for the casino itself.
Another thing is I think why some casinos don't do it at the beginning is because of User Experience or Customer Onboarding, the more easy at beginning , the more user they will get will us the platform. That's why most of casinos I experience is KYC is not at beginning.
I wouldn't mind submitting my KYC in the beginning before making deposits, as far as I know that the casino is reputable. I also think that the reason why some casinos don't ask for KYC in the beginning is to encourage more gamblers to gamble in their casinos, the easier the process to get in the more customers they'll get because it's not every gambler that can be willing to submit KYC unless it becomes necessary to collect their wins. I believe that the reason why casinos even requires KYC is because of government, I don't think that they'll bother about KYC.