In short, consultancies.

There are many good ones, and many rip off artists who spend as much time disguising their horseshit as they would just doing real work. At a certain point, consultancies started hiring less and less experienced people who had to sell more and more bullshit.

Acronyms and abbreviations are psychologically powerful; they imply something is commonplace or important to the point of it not needing to be spelled out. When you suddenly coin a random one you can pretend you know something the listener doesn't-- you're right back to the emperor's new clothes--most people are too scared to ask. Any industry, same shit.