The part everyone is especially loving is this:
"Surveying the AI’s responses for misleading content should be “based on your current knowledge or quick web search,” the guidelines say. “You do not need to perform a rigorous fact check” when assessing the answers for helpfulness."
Which, against the grain, I think might be perfectly fine. Your model is based on random information gleaned from the internet that may or may not be true, this is the exact same thing. Doing any sort of rigorous fact-checking muddies the waters of how much you should be trusting Bard's output.