Actually there should be no problem with auto process of an amount like $50k because casino would always based in your pattern of deposits and withdrawals, so if you are within the range, there should be nothing suspicious about the transaction.
For instance, you are a gambler who deposits $50k to $100k and you made a withdraw of $50k, that should not trigger the system. However, if your range is at $100 to $200 only and you request a withdrawal of $50k, then surely that would alarm the system.
To provide support to your argument which of course is correct, on the HugeWin website in the AML withdrawal procedure section, it is clearly stated that:
5.3 Withdrawal Procedure
When reviewing a customer’s account prior to withdrawal the agent must answer the following questions in the AML segment in the Risk Entry:
1. Did the player wager?
2. Does the payment Method belong to the player and has the player used it to deposit?
3. Are the customer’s transactions and bets in line with expectations for the player?
https://hugewin.com/en/content/antimoneylaunderingpolicyThere if there is inconsistency in the players historical deposit and withdrawal pattern it will trigger the system.