Perhaps "trust" was a bit misplaced here, but I think we can all agree on the idea: Before LLMs, there was intelligence behind text, and now there's not. The I in LLM stands for intelligence, as written in one blog. Maybe the text never was true, but at least it made sense given some agenda. And like pointed out by others, the usual text style and vocabulary signs that could have been used to identify expertise or agenda are gone.