It's a easy solution to this, if you can deposit and play no matter the amounts, you should be able to withdrawal also, if they detect any problem they should stop you at the deposit and then require KYC.
Then you can choose to either get deposit back, or do KYC and then start playing and then if you win big, they should not say anything just cash out your winnings, I can't say exaclty how it should be.
But it for sure it's possible to create a thing to make things like this end, but the easy answer is they don't want to.
They select some big winnings and will make that money theirs no matter what how honest the player are or how much KYC he send them, cases like this we have proofs of.
But still.. they running and laughing in the mirror every morning, it easy to scam people when you don't need to see your victim in the face I guess.
And when it fill your bank account to the top, I guess it's also get's to be an addiction, many online casinos should get their license withdrawal long time ago... but everything is corrupt.
This is a easy method to adept, trust me. But it would make all the casinos winnings
a lot a lot a lot less, so they rather act sneaky so they can make more money. No moral. No respect. Only money money!
This is disgusting humans form the start to the end!
And a lot of people promote this sneaky casinos here I see but still has a opinion, that is funny.
I am not saying that people that do the promoting here are bad humans or in at the scam, but I think they are a bit hypocrite.
That's just my opinion on this and not any fact, so people don't need to take it personal.