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There is a huge chance for a gambler on a winning streak to get greedy but if he is disciplined enough and keeps on the planned activity, he can avoid being greedy. Though I agree that most of the time gamblers that has no dedicated plan for gambling often got hooked on the winnings and get greedy until they lost everything. But OP's story is different, the person in the story managed to stop and get away with the winning with motivation in hand which solves the problem of his company later.
What happens here is that it is a circumstantial and very specific fact that we want to generalize, the fact that he won money in bets and used it for his company, is random and he should not subscribe to the fact that he was able to growt his company for that reason.
Possible results:
- The company was successful and has maintained that throughout the years.
- The company was founded with those funds, it worked well for a while but it disappeared, something normal.
- The company was founded had a success, very short.
- The company was founded, but did not reach the objectives, failure.
The above has nothing to do at all with the fact of getting that money and the consequent success, since the money for company could come from different options.
In other words, the OP's context and the question in the title of this post are like "bipolar".
Casino can play a role in changing fortune? Yes.
OP's context. No, not necessarily, do business, ventures, etc. and winning a millionaire prize do not go together as you might think.