Moreover, dice sites, that require user to sign up, may track betting pattern of a gambler and generate random numbers accordingly. This probability is absolutely non-existent in this game.
You can track betting patterns without signing up.
How?
If the games are not provably fair, they can generate whatever they like and this totally independent of your betting pattern!
I made the statement for chain-bet and other provably fair games. Games, that are not provably fair, are out of question.