Creating opportunities for people to gamble - new casinos, scratch-off tickets, those sad machines you see in bars - all of these are cash generation vehicles that historically have highly negative outcomes for members of the communities they are dropped into. Especially for groups that are already disadvantaged. This isn't academic speculation.
As for gambling on every day outcomes - otherwise known as living your life - it's reasonable to say that one of the fundamental measures of progress as a species and a society is our distance from accidentally eating poisoned food, dangerous driving, a lack of opportunity and self-determination, and being forced to accept bad partners.
In other words, the more we remove gambling, the better our lives become.
There's an interesting discussion to be had about truly free markets, for sure.
However, the modern stock market is neither fair nor random. It's not accessible to you or I in the same way that it is to financial institutions. Front-running and dark pools are accepted as normal. https://www.youtube.com/watch?v=bP74RBTE8kI
I would also suggest that Warren Buffett does not see the stock market as random or gambling. When he buys a company, it comes after huge amounts of research. A good stock trader obsessively researches the companies that they invest in. While it might not be anything like a guarantee of success, I sure hope you have better than Vegas odds when investing in a company that you've learned everything you can learn about without becoming an employee.