If Gambling was not introduced then many people have to do the hard work for earning money.
In my own personal opinion, if gambling was not introduced i think everybody are working hard in their jobs, so they could earn to provide all of their basic needs. And also people are not taking a lot of risk in just to earn a huge profit.
For me, I think when gambling was not introduced, people will be very busy on their social media platforms and other physical activities that could really improve overall health and healthy living.