After using so many casinos I would not deposit into any licensed casino without first completing KYC, because if it's too troublesome I don't want to find out about this only when I make a big win and want to take my money out. Better to not have any more barriers since the start because then you know you won't have other issues since day 1.

I know many people dislike KYC and I would not do KYC if not needed by the law, but we know 99% of the casinos ask for it so you know you just have to do it if you want to use them.

Are you sure that you can visit physical casinos without KYC?

In the USA, KYC is required at phyiscal casinos and I believe that in most of other nations, you can not get in a physical casino without your identity card submitted at their entrance. It's not about money laundering or only about it but also about security of the casino as they must know who you are, where are you from in case you did something like attacks their casino, they will be able to find and arrest you later with report to police.

Finding casinos online without KYC is more easily than with physical casinos.

That's right and this is the example on what will happen after they win huge on a physical casino https://www.feelingvegas.com/what-to-do-if-you-win-in-las-vegas/

They are subject to undergo on more stricter KYC procedure that's why there's no sense at all saying that they should go on physical casino if they don't want KYC since this places implement more stricter rule regarding on this matter. Also they are also active taking out taxes from your winnings so with this we can really say its more better to gamble on a reputable online casino than those physical casinos due to those technicalities.

It's about huge win, but I meant you have to complete basic KYC before entering a physical casino for playing.

About advanced KYC after a huge win, it's similar to online casino too. They do this to have more information about the player, just in case government asks something from the casino business, like money laundering investigation for example. This extra KYC is like another layer used by a casino to defend their business, like whether the user has bad record, like legal issues, cheating, and money laundering too.

Generally, if you are clean, you don't have to worry about successful chance of your extra KYC, but surely it harms your privacy and anonymity more.