Yes, there have been a few people who have become rich solely from casino winnings. However, it is important to remember that these cases are extremely rare. The odds of winning a large sum of money at a casino are very small, and most people who gamble will lose money in the long run.
While there are certain individuals who have become millionaires from sports betting, it is important to remember that this is the exception rather than the rule. The vast majority of sports bettors will not achieve this level of success, and many will lose money over time.