I had a bizarre interview (at an extremely well-known company with an eccentric, controversial founder) where the recruiter asked me directly questions that "BigTech interview training" explicitly taught me to never ask or even walk close to. I was actually shocked and stammered out an awkward "Uhh, I'm pretty sure it's fraught with risk to even ask those things" non-answer, but she seemed genuinely surprised I wouldn't go into personal family details during a professional job interview. So, it seems not everyone has gotten the memo...
Example: At the very start of the interview, candidate suddenly feels like they have to hide something about their religion, sexual orientation, or whatever, in how they answer. Or feels like their candid answer to the icebreaker was not received well.
Which is the opposite of what the interviewer intended, with an icebreaker, but their training didn't include how tricky casual icebreakers can be.