I have bolded out the most important factor associated with your case. Now although you have mentioned it clearly, I still want to clarify few things;
Did you get any notification through email/SMS/onsite popup etc.?
If you got the notice beforehand (while you could alter your trading position) I do not think any case could be made against the platform in question. But if you do not get any notification through email/SMS/onsite popup etc. then in this case casino in question is liable to compensate your loss.