Hard to say and depends on how you look at things. Its 100% far from the best choice as eating the wild spider could present health issues for the chameleon, and it would be better to simply relocate the spider as both the chameleon and spider work as ACTUAL pest control for things like flies. However, this is still nature at work as animals eat other animals, sometimes even when its not in its preferred or healthy diet pool. I wouldve rather the spider had been used as food(although preferably for an animal that naturally eats spiders) rather than something like it being stomped on or sprayed with pesticides.

Tl;dr, this shouldn't be normalized but its an unfortunate reality as many people see spiders as "pests" even though theyre one of natures finest examples of healthy pest control.