I think he's talking about investing in casinos, which is the same thing as gambling: you're gambling your money and you never know if you will ever see it again.
But investing on casino houses is not same as gambling, but it is high-risk investment product. If you don't monitor your investments, then you may lose a lot of money over the time, but you will not lose all your money instantly as it happens in gambling. In the long run casino bankroll investments usually give good profits, and I prefer investing on a casino is better than gambling.
You don't need to monitor it every day, there's not much you can do about your investment, it's all based on like, which is on investors side, because of the house edge. You should only look if there are signs that casino is being exploited, like it happened with Primedice last year.