ACT and SAT each have their own parts of the country. The GRE has its lock on graduate admissions. And so, one could blame the companies, but really, economically, they have no incentive to change things very much because they're getting the business. ↗
I attended schools in Seattle through the University of Washington, from which I was graduated in 1931. I spent the next year at Northwestern University. ↗
I myself have been on my own and utterly independent since I graduated. I haven't belonged to any company or any system. It isn't easy to live like this in Japan. ↗