Mostly that they prepared for an algorithms question.
It may be a good filter for 3rd-wave do-as-you're told programmers who stay in their lanes, produce by the book expected code, and just consistently obediently build things.
They wan better cogs for the corporate software machine.
If people are asking me algo questions, the job probably isn't right for me because my answer is "it depends". Last time I took one I was thinking "there's like 4 answer to this, what the fuck do you want?" it might as well have been "I'm thinking of a color" ... they have something written down and called it the "right" answer.
I gave a parallelizable answer, they wanted single threaded. I gave a single threaded one, they wanted 2 passes. I gave them a 2 pass version, they wanted one that didn't use collections.deque, I mean it was nonsense. "Guess what's on my piece of paper!" Cool beans bro.
Some people would have given them that answer the first time, I'm sure of it. Not me though. Not during the interview, not during the day-to-day.
I don't know how. I really don't. I don't know the right answers, all I see are a bunch of possibilities. That's why I'm first-wave.
The writer of homebrew isn't what Google is looking for anymore. His time to get hired there closed around 15 years ago. After the revolutionaries comes the administrators, a far less interesting but necessary entourage.
The people like me have all already quit. I've actually got nothing to offer them.