GLP drugs aren't an appetite suppressor in the conventional sense, they're a metabolic regulator. And the scientific understanding of obesity has moved far beyond "it's your lack of willpower and bad habits". There wasn't some mass failure of self control in the 1960s, when obesity rates began a steep upward climb.
Appetite is the second most powerful biological drive after breathing, and insufficient production of glucagon causes a dysfunctional appetite powerfully driving behavior to take in excess calories. These drugs compensate for that shortage restoring a normal appetite. They're intended to be used for life. Though multi month and eventually year long versions are coming.
During human evolution, ripe fruit would be available for short periods. It was advantageous for appetite control to be suspended so we'd take on excess calories while we could. Fructose (a liquid sugar in fruit) reduced glucagon production, and appetite would temporarily become intense.
The theory as to why obesity took off about a decade after liquid sugars were introduced into processed foods, a pattern repeated in every country this has happened in, is that continuous exposure to liquid sugars in childhood "breaks" the glucagon-appetite regulation mechanism,