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Not only roobet other casino can have some .
In the case of "Slot" always be paid by the bet spin you spent with x maximum multiplier you can win, every casino needs to pay according to that's since the game slot was based 3rd parties service not from original game from them so the casino cannot decide the maximum $ payout.
Other casinos can have the same result who someone winning a big money more than a hundred thousand dollars because almost every casino using 3rd parties service slot providers.