For KYC casinos, it would be good if people that are signing up should do KYC before they can deposit.
It is a very good idea but it would be good for punters to always read casino ToS before they register and they should provide necessary documents for KYC, they should do KYC before they deposit.
Many gambling sites are doing this to cheat their customers, it is common everywhere.
This also isn't a good thing as there should be limits to how much you can play with no KYC. It's literally stupid to ask KYC from people who come to test the site with $50 when you can do all financial operations with no KYC up to a much higher limit.
The minimums of $100 USD for deposits and withdrawals should be completely fine for any banks, governments or casinos. Nobody is going to launder such small amount and making people compromise their ID just to spend a few dollars makes no sense.