Then I guess those people will sporadically gain weight

I'm currently on my second extended period of GLP1 agonist unavailability (country-wide). The one I have been using is dulaglutide which is much less potent than the newer ones (it's the only one legally imported here) but being cut off still sucks. However, it's far from the only medication I'm on and not even close to the worst one to be cut off from or the first one I've had issues getting. It's just part of life in the third world at this point.

In that scenario I'd be more concerned with food insecurity rather than the drugs that make me eat less.

Then they will regain (some of) the weight, most likely?

They’ll have to deal with that, I guess? What’s your point? That’s how everything works.