That's the basic knowledge that comes with the use of everything as using it too much means you are absolutely abusing it and it's definitely gonna tell on you and same goes with gambling, eating, working, and every fucking thing we can think of.
Gambling is definitely gonna wrecked you if you take it too seriously and as a means of getting millions and the same way it can lead you to other type of addictive behaviors.
That's a pretty general observation, but not entirely wrong. The problem with gambling, though, is that unlike eating or working, activities that have necessary benefits, gambling is mathematically designed to make you lose in the long run. So while moderation may make sense in other settings, in gambling it only serves to delay the inevitable loss. The main scope of gambling is fun, not getting rich