Because in some other country that wasn't so well off, these entities (and other countless other interests) might be enough to push the country over the edge into [outright inefficient | corruption | drag on economic growth] territory and people would be rightfully indignant at middlemen skimming off people's inconvenience to enrich themselves.
Maybe it's also the curse of having had such a long and stable history that enabled legacy interests and systems to arise, where eventually you need another country to show you what's possible when you start from scratch for you to realize that the way you're doing something is just stupid.