The website of the company Level Trade is completely unavailable, but I have not seen anyone saying that they have been scammed. Does this mean that it is not a scammer?

Level Trade is a forex scammer and plz don't invest here. If you're just starting out in trading, take it slow and be extra careful when choosing your broker. Don't let the excitement of making money cloud your judgment. Always look for reviews and do your due diligence before handing over your cash.