Internet is full of reassuring stories on big gambling wins like ten/hundred -thousand-dollar, or even more, while in most cases the gamblers are losing because they are either not the experts in on gambling they try or have not relevant skills and make foolhardy bets.
There is no such thing as every person winning in gambling, all games have profit and loss. Because you see the old gamblers are mostly the ones who complete more experience and succeed, but the only new gamblers are the ones most people face. Because those who are more experienced always win but sometimes they can't win when addiction happens. Basically gambling depends on addiction, the more addicted a person is the more losses they face. And many new gamblers who are not fully experienced are currently becoming experienced, but it is not possible for every gambler to be experienced because there are many stupid gamblers.