Yes, normally when I go to a casino I move little money and if I win I would not like my Winnings to be Blocked because the casino has suspicions of money laundering, when there are licenses the casinos can look very legal, but they can scam, they can to launder money and legally, the only way is to trust the most reputable casinos.
Yes, we can trust reputable casinos but I still advice to be vigilant. Don't leave all your fundings as a bankroll on any gambling platform. Just deposit the amount you are able to lose, and withdraw winnings regularly.
When using casinos, we have to really trust them so that there is no feeling of worry or fear when playing. It's just true what you said is that you have to stay alert so that bad things don't happen in the future.
Keeping large amounts of money in a casino wallet is not a good thing because it is very high risk, moreover the account that is used can also get suspicion from the casino team.
I myself always choose to deposit a certain amount of money when I'm going to gamble and immediately withdraw everything if there is more profit or a remaining loss which is still quite a lot because if I don't withdraw everything then it can run out because I want to go back to playing.