In my uneducated opinion, Google's hazing interview is not to establish whether one can write a for loop or not but to establish how dedicated one is to working at Google. An anecdote: I interviewed at Google ~10 years ago and failed. They did not ask anything complicated (I don't know if it was because the polices were different or they actually needed someone with my expertise) but I had a complete brain freeze for some reason. Anyways, ever since then a Google recruiter reaches out every year or so. I always tell them to get lost because I already failed and they always respond that most of their employees pass on second or third time only.

Now, recruiters could have been lying about that but on the other hand, they obviously know that I applied before yet want me to apply again. I'd imagine a regular company would have done something about their recruitment process if they had that many false negatives. However, if I wanted to get dedicated employees, that would be exactly how I hired.

This is the real difference between the bar exam and a Google interview, in my eyes. The bar exam is intended to pass everyone who meets the standard: your score on the bar is supposed to be an accurate measurement of you. And conversely, if you know the material, you should pass the bar. California's bar exam is considered infamously difficult because the passing rate is "only" 45%.

None of that is true of the interview. There is no notional standard. Assessments of the same person vary wildly from sample to sample. If you know the material, you are nevertheless expected to fail.

This is very true. Unlike an examination there is neither a well defined set of questions nor even a well defined condition for succeeding! It's not good or bad as an interview should be an informal and subjective evaluation. But it does make comparison to an examination invalid just from the procedural point of view.