What I meant by that is that no packaging ecosystem (to my knowledge) runs arbitrary uploaded code to find network activity. Some may do simpler, static analyse

What I meant by that is that no packaging ecosystem (to my knowledge) runs arbitrary uploaded code to find network activity. Some may do simpler, static analyses, but outright execution for dynamic analysis purposes isn't something I'm aware of any ecosystem doing. Python, Ruby, et al. are in an even worse position than that baseline, since they have both arbitrary code in the package itself and arbitrary code in the package's definition. But the problem is a universal one!