From all this, in order to avoid many problems, people who consider themselves whales, before making any deposit, should contact support and say that they are players who like to bet a lot of money, and that they do not want to have problems when withdrawing, because I think that support will tell you how to do it, what type of KYC you can do, and in the end that is a support that will remain for the player in case of any inconvenience , well at least I would do it that way.
This isn’t necessary if you choose a reputable casino to play with. If you consider yourself a "whale," then you should choose a very liquid casino, the one with a good reputation for paying out big winnings in a reasonable time. That solves the problem. In terms of KYC, I think this doesn’t differ for any gambler; regardless of how much you bet, the same requirements should apply to you and everyone else.