I've found the free one can sometimes answer tip of my tongue questions but yeah anything even remotely obscure it will just lie and say that doesn't exist, especially if you stray a little too close to the puritanical guard rails. One time I was going down a rabbit hole researching human sex organ variations and it flat out told me the people in South America who grow a penis at 12 don't exist until I found the name guevedoces on my own, and wouldn't you know it then it knew what I was talking about.