I’m only reading this issue on scam accusation but this is painful if happened to me like hitting max multiplier on slot games that result to 50K profit. Can’t imagine finally hitting my dream multiplier then casino seize my profit. This is just an abstract discussion so we are not really assuming that casino will do this especially the reputable casino.
Can you do me a favor by telling me the name of your country? 50k is too small for any casino to hold for any reason, if they are finding it hard to pay 50k then such a casino can't be trusted, I can call my lawyer on this and we go to court, this will be resolved in a court unless I don't have the rights, or I can't provide some legal documents.
You should always use a popular casino to gamble, you can't be struggling with luck for months and eventually you get lucky only to have problems withdrawing your rewards, thats going to be a very bad feeling, always use a online casino that you can trust.
If its only $50K, the lawyer fees could be the same or more than that.
There are still other options and free, such as bring the dispute to the casinoguru or askgambler.
To the OP: After winning $50K from slots, and you submit a max daily withdrawal/big amount - the casino might ask for a normal KYC, such as an ID or passport.
I dont think the casino will make it hard for you, because you win it from slots (almost impossible to abuse).
And yes, there are some casinos that will ask for a proof of income/source of income such as payslips or screenshots from your trading account or else.
The casino cannot confiscate the money/crypto you have, after the KYC process is complete they have to pay it.
There are still many crypto casinos that are not too strict with their KYC policies, and its not too difficult to find information about that on Bitcointalk.
Check their threads and topics about them in the scam accusations section.