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.
Provably this is revenge from the site where he lose his money so better not to take him seriously since we cannot trust those people act like that, Maybe for others who think about earning big money or want to become instant millionaire they should think more deeper since gambling is game of chance and intended for entertainment, they should put that in their minds so that they will not put their life on it and put all their money on it.