Why couldn't any other agency create a course that teaches what they perceive to be DIR principles?
There it is ! You answered your own question. DIR is DIR, there is not much to percieve.
Anyone can start teach a course based on the DIR principles. But in the end all those courses would have to produce endresults that are comparebly in high standards. In practice I just do not see that happening. As long as agencies teach based on what they perceive to be DIR it is anything but DIR..
I really hate that term...