Not that I endorse this kind of behavior by them but I can tell you for certain that they aren't the only ones doing this and I know they had to get this idea from somewhere else doing the exact samething.. Btw, having tried different platforms around the forum,  I can say that I know another platform that does this and gives such kinds of incentives for X spins and all kinds of rewards, but you know what, if a casino is good they don't need to farm reputation this way, their works speaks for itself.