Probably he has lost a lot of money and now he is showing his reaction. Such things wont change the result of the game and neither they will bring back the lost money on the gambling site. Better he should forget this and move on.
That was also the first thing that came to my mind when I read the accusation.
But if you take a closer look at your trust rating from JollyGood, including the reference that is given there ... This was not the first time he attacked the casinos of Daniel/RHavar with such false accusations.
Personally I find it a great pity, of course. The false accusation of a single user is of course not harmful to business, but it just doesn't have to be.