2) Do you think it can become a source of reliable passive income for you?
some of us of course they do, but majority ? what happens is the opposite and in those ? they are accepting that fact because gambling is a place to lose money but to gain happiness .
The majority of us will lose and cannot recover from that defeat and can only regret it. But some will be okay with the loss and continue playing other gambling games. But if they still think that playing gambling can be a passive income, that is a mistake and will never turn out to be what they want. They should change that mindset and not think about making money from gambling.
You can make a living out of gambling, just not as a player because when you are the player, the odds are stacked against you. Even when you build your own casino though, it is still not going to provide you a passive income because you will have to fix the bugs, keep an eye on the hackers/abusers etc. It is just another full time job.
You can make money from gambling as a casino owner but you can't make money passively. If you want passive income buy a real estate and rent it.