Is it that people are just pretending to be gambling for fun meanwhile everybody (all gamblere) are actually gambling for financial gains.
There are indeed gamblers who play just for fun, but that doesn't mean they don't expect to make money.
Gamblers who say they are just for fun but are addicted are very likely to happen not only because they are lying because it turns out they are very aggressive in gambling but it could be that the addiction occurs slowly, initially just for fun but slowly because they really like the game and start to be aggressive so they fall into addiction.