The great thing about these drugs is- you don't have to take them!
At the moment, they are expensive or only on prescription, so no-one is coming around to your house and making you comply...
They are not a miracle cure, because no drugs are miracle cures, they have downsides, they are quite unpleasant to be on and they don't solve some of the problems of weight loss which is that it is hard to sustain over time.
But, within that, they are effective.
You are 'concerned' but you should be concerned why our food culture and the food industry have knowingly and happily (for their profits) produced less nutritious food, in huge quantities, at cheap prices, and made 60% of the adult population overweight or obese. Even trying to 'eat healthy' in the UK is almost impossible as the quality of the food such as chicken is very very poor due to farming practices (stuffing meat with water, sugar and antibiotics).
Celebrities are different as they are richer and their livelihood depends on looking a certain way. Yours presumably doesn't and if some people are given a glimmer of hope by being able to at least start to tackle their lifelong obesity problem, what is it to you?