I can't help but wonder, what was the test like that you could prepare cheat sheets for? most dev interviews are problem solving that you can't simply lookup in

I can't help but wonder, what was the test like that you could prepare cheat sheets for? most dev interviews are problem solving that you can't simply lookup in 5 seconds just curious why they are so paranoid about that. i do phone screens where i can hear people type to google for answers but it's usually pretty easy to tell that they don't know something and then they come back with textbook answer. but most questions are not the kind you can just ask google.