The drug works by improving peoples' habits around food. It's not some stimulant or "fat burner," it results in less hunger and lower desires for the ultraprocessed unhealthy foods. These same drugs have shown some promise in reducing other addictive behaviors like gambling. That's why it's so intriguing. It doesn't work like other "weightloss drugs," and it reinforces the idea that obesity has some things in common with other addictive behaviors.
The difference is you don't have to smoke, gamble or drink to live. But you do have to eat to live. And eating is at the foundation of society. How do people celebrate? How do they mourn? How do they socialize? Lunch, dinner, "coffee," tailgate... People lead busy lives, which leaves less time for meal planning and prep. The GLP-1 drugs help people start to break that cycle.
Everybody knows how to lose weight, and nobody wants to be fat. If it were that simple in practice, there wouldn't be fat people.