Thanks for the information!
Your project at first glance has features that could be related to gambling, but there are a few important aspects to consider in order to accurately determine if it qualifies as gambling. If case opening uses randomness to determine the value of items, it resembles the mechanisms commonly found in gambling. Randomness is a key element in gambling, and if your users are relying on luck to obtain a valuable item, it could be perceived as gambling. I advise you to look at similar sites that are successful. For example
here you can see how you can make a great site with a similar theme.
