Because when people use LLMs, they are getting the tool to do the work for them, not using the tool to do the work. LLMs are not calculators, nor are they the internet.
A good rule of thumb is to simply reject any work that has had involvement of an LLM, and ignore any communication written by an LLM (even for EFL speakers, I'd much rather have your "bad" English than whatever ChatGPT says for you).
I suspect that as the serious problems with LLMs become ever more apparent, this will become standard policy across the board. Certainly I hope so.
A good rule of thumb is to simply reject any work that has had involvement of an LLM, and ignore any communication written by an LLM (even for EFL speakers, I'd much rather have your "bad" English than whatever ChatGPT says for you).
I suspect that as the serious problems with LLMs become ever more apparent, this will become standard policy across the board. Certainly I hope so.