I think this is no different than the slots you find in casinos or those video poker machines in some bars.
Basically the house edge is clearly a rip-off but people are still playing their game.
All they need is a few gamblers a day and it's goodnprofot for them.
I dunno how house edge is calculated. I check winning % in bet history. Right now, there are 5 10x wins out of last 50 bets. Which means, winning ratio is 50:50. Is not it good?
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.