Plenty of kubernetes use cases where fetching some http resource and storing the result in a shared volume where some other container can access it.
i.e.:
* InitContainer in a pod
* step in an Argo Workflow
Is the question why a wget container image exists or why there are multiple versions of it? The former – because it is useful. The latter – because there isn't a single official version so people just created their own, and others started downloading them.
I'm assuming the question is more
Why are there multiple images doing the same thing?