I trade a small amount of money on crex and I rarely find a problem. I just say this based on my experience with crex.
The trick is that you can trade and withdraw without passing KYC (if you have deposited before they decided they need KYC), but to be able to to deposit you need to pass KYC. The system will simply hide behind "*****" deposit address. It will show you deposit address for few second, and if you are quick and lucky you might copy that, but then KYC message will appear. If you decide to deposit without passing KYC, your account wont get the funds, because in these few seconds they show some general deposit address, which is not connected to any user. (like it shows you "123123123" address, but when you pass KYC your deposit address is "qwerty").