It's always been the case that to a certain degree, we learn how to express/think/desire from some "subject-who-is-supposed-to-know", but the difference with something like ChatGPT is that this subject is now disembodied and perfectly anonymous.

Those last two are really important: as teens we learn that our parents and immediate graph of authority figures isn't what its all its cracked up to be because we can register their various, previously suppressed antagonisms and inconsistencies as demonstrating they are not that "subject"; ChatGPT leaves no room for this - an inconsistency doesn't 'belong' to it ("it'll get better") and it has no body with which to center our projection of its consistent identity (it is technically the 'body' of human knowledge) and so compare to others.