Some ppl gambled for fun that's how their addiction started. If they're gambling with the correct mind it isn't going to become a problem but if their mind gets addicted to gamble it's going to change their life for ever. When you gamble you're going to lose money the companies don't.
Excessive of anything is bad. Gambling is a social vice and a practice that can lead you to addiction. When you fail to realize that you can be addicted for merely gambling for fun, you will limit the time that you are spending on gambling. Healthy gambling should be practiced to avoid bringing shame to yourself and your family members.