That's a bold statement Sir. But if you know gambling platforms cheating users you have to name them here, otherwise you're a kind of accomplice. Why don't you give any name here? I don't understand what you're afraid of? It would be more easy to understand what you're talking about  precisely
But if I understand correctly your explanations another solution could be to hash a listing of the numbers of the next winners and to show it after several games.
For example :
Game 1 : First player
Game 2 : Second player
Game 3 : no winner
...