Why Pure RNG is Broken- Building a "Card Deck" Lottery in Rust

"Pure RNG promises nothing. A shuffled deck promises everything - eventually." When designing the reward system for active users at SolChekers , we hit a classic Web3 wall. Usually, projects just roll a digital dice. You get a 1% chance to hit a jackpot on every action. Mathematically, it’s completely fair. Psychologically, it’s a disaster. With pure independent probabilities, a dedicated user could perform 500 actions and win absolutely nothing, simply because they hit the bad end of the varian