I don't know how things are in other countries, but here in my country I've seen many people involved with gambling, and the number of people addicted to gambling is very small, which led me to believe that cases of gambling addiction are relatively few. If the number were very high, then governments would have already blocked and banned all casinos in the world. That way we wouldn't see gambling anymore. So if we don't see that, it's because governments know that the number of people addicted to gambling is low.
Now with licensed online casinos popping up and offering easy access to games that are very addicting such as slots the epidemic of gambling addiction is growing and on fact becomes worse by the day. It doesn't seem to be slowing down..casinos are allowed to advertise everywhere and also without restrictions about where they place ads. So more and more people are attracted to these schemes. In the end it becomes obvious governments are not interested to limit addiction so long as it remains profitable. Sadly it's an epidemic that isn't well studied although very widespread. Any country that has legalized gambling faces it to some extent or the other.