Maybe it's because I'm not trying to market anything myself, but I have no respect at all for reposters. Further, I think reposters should never be called "curators" and to confuse the two is just giving power/legitimacy to the reposters.
Instagram should at least attempt to do something about this issue other than relying on users to report them. All of these accounts have similar patterns on how they operate. They shouldn't be too difficult to find.