If they have existed for this long, it means that they are worth looking at as one of the successful ones, for four years in the crypto space is never.
I checked the website and i discovered they are very much active and alive.
I also went further to check xaurum on CMC, I have a good volume, but the only issue is that the price is not in correlation with the real gold price in the global gold market.
The website says that 1000 xaurum is equivalent to 1g of gold and 1g of pure gold as at today is around $55 dollars, but after calculating that of xaurum, it is around $40. The margin is too much.