Is GMX com a safe site?

Can you tell me if GMX.com is a secure and trustworthy platform for cryptocurrency trading? I've heard about it but I'm hesitant to invest my funds without knowing more about its security measures, reputation, and any potential risks involved. Could you elaborate on the safety protocols they have in place, as well as any red flags or concerns that have been raised by the cryptocurrency community or regulatory bodies? I want to make an informed decision before proceeding.