it should not be used to seek out factual information that the prompter doesn't already know.
Eh... Depends on the importance and purpose of the information.
If you're just trying to generate ideas for fiction from historical precedents, it doesn't matter if it's accurate. Or if you're using it as a starting point, then following the links to check the original source (like I do all the time for Linux terminal commands).
Hell, I often use Linux terminal commands from Google's search results AI box—I know enough to be able to parse what AI is suggesting (and identify when the proposed commands don't make sense), and enough to undo what I'm doing if it doesn't work. Saves a lot of time.
Copilot fixed some SQL syntax issues I had yesterday, too. 100% accuracy on that, despite it being a massive query with about a dozen nested subqueries. (Granted, I gave a very detailed prompt...) But, again, this was low stakes--who cares if a SELECT query fails to execute.