Well, actually there's a similar product already. Please, check https://structure.finance/dnt/
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The world of trading allows you to trade options, the broker only earns fees, it is the sellers and buyers who "fight in the arena". However on this site, it seems that the players bets against the "casino", the opacity of the calculation allowing to place the high and low limits prevents us from knowing the margin which the site takes.

At Purple-eyes, we take a clearly displayed fixed service fee. We have no advantage in this or that player winning the jackpot, so we are much more in the spirit of a site at the service of players, than a site against which the player must win.