I'd break that down like this:

Google-esque companies figure "Let's just ask these hard puzzles to filter by IQ, everything practical (e.g. databases) can be learned"

However, some companies tend not to see these specialized puzzles as an IQ test, but rather a memorization-based learned skill (learn these 10 algorithms and their performance metrics). To them, asking questions that represent day-to-day job challenges is a better predictor.