There was a point a year or two ago where everyone was recounting these stories of how AI targeted advertising was terrifyingly accurate, it could tell you were

There was a point a year or two ago where everyone was recounting these stories of how AI targeted advertising was terrifyingly accurate, it could tell you were pregnant before you found out for yourself, etc. At the time I was routinely opening YouTube with cookies disabled and getting suggested YouTube generated categories with a super low hit rate, stuff like "Recipes" that would be filled with nothing but general interest food videos (i.e. "you won't believe what we found at this market", "we made the largest burrito ever", never with any instructions), "Metal Music" containing a single acoustic cover a metal song and half a dozen EDM tracks or "Role Playing Games" stocked to the brim with Fortnite videos. I just checked now and it's better than it was but there's still a "DIY" category containing one DIY video, a Japanese cooking tutorial and a video of somebody putting iPads in a bucket of slime. I'm not sure I have very much faith in their ability to deeply infer things about me from a limited dataset when they can't identify videos with ingredients in the description or sort music into genres given the set of all music (and millions of comments on it) to work with.