This discussion is not about gambling, it is about investing, but I will use gamblers to make an example.
Using gamblers as an example who start out with just the intention to have fun maybe and then along the line turn into addicted gamblers that gambling begin to affect other areas of their life like their wellbeing like they stop spending on some important things just so they can make money available for gambling. Now talking about investing, I think it is possible to become addicted to investing so much that it begins to affect your wellbeing, like the person stops spending on other important things like good food, good clothes etc. just so they can have more money to invest? Do you consider that kind of addiction dangerous and not good?
That is the reason it is highly not recommended to invest using money that is a basic need or to finance daily life. Using the example of a gambler's addiction and an investment addiction there is no close connection between the two, the adrenaline rush produced from these two addictions is very different.
Gambling addicts can sometimes be at gambling venues for hours just hoping for a win. Gambling will not drain a person's well-being as long as they can control themselves. Addicted to investing because often get profit. IMO
Someone will not invest all of their money under any circumstances, they will leave some of their money to buy things that are considered necessities of life.