I wonder how much the difficulty/pain of interviewing is a joint effort by big tech to make it annoying to switch jobs once you get in? I have met numerous FAA

I wonder how much the difficulty/pain of interviewing is a joint effort by big tech to make it annoying to switch jobs once you get in? I have met numerous FAANG engineers who say they would never want to do the process again and, despite [insert a normal work gripe], interviewing at another well paid company is too much work. Certainly before big tech agreed not to poach from each other once upon a rime, but now I wonder if this is a lower grade version of this?