If you ever play on big casino like bc.game or stake.com, you will understand there is always some kind of "maximum winning".
Thus you won't able to become millionaire by playing on that site alone for that reason.
How do you mean by this? The maximum winning amount does not stop one from becoming a millionaire. If you're already a millionaire and you have enough spare money to wager, then you can probably make a large amount of money.
The maximum possible bet amount is $1500. Game rules state that the maximum possible multiplier is 12500x.
From this information, we can determine that the maximum possible payout is a whopping $18,750,000 (1500 x 12500 = 18750000). Yes, that's 18 million and 750 thousand USD.
source And why will someone have to put his hope on gambling to become a millionaire? That will be really exhausting, as no matter how good someone is, there is still no sure game at their disposal, and most of the most promising games can still end up failing the person. This is among the reasons why I always discourage people from paying for odds if the prediction is too good, as the person claims they will not even make it public as they will have to enjoy the glory alone.