That's the simple truth, addiction doesn't come one Day but it may start off gradually as a fun untill it becomes a strap. That is how every addicted Gambler once started untill it get worst. One thing people do is that they keep on doing same thing repeatedly and hoping for change where as there are no hope.
Addiction doesn't comes from anywhere and start to grow on people, there must be a sign and the signs are the obvious ones but they will chose to ignore them and focus on what they are doing until it no longer able to control again and even at that, some of them will want help or call for help while some will never even know what to do in such situations, some will continue to be doing what they know best, continue spending on unnecessary that wouldn't return them anything.
When you see a an addicted gambler, it didn't start from that day and most often, the signed that led to where they are obviously ways to get money through gambling, it's very difficult to see a person that is gambling addicted and don't gamble for money, if you gamble for fun and addicted to gambling, then your own level of commitment to gambling will be different when they lose money in gambling, there is nothing that will make a person who gamble for fun to be angry because they lose a game.