The whiteboard threads are always interesting to me because with more than ten years experience in software development in enterprise and startups now, I've never had to do a whiteboard interview.
Are they common outside the big six names? I.e., outside of Facebook, Google, Apple, Microsoft, Amazon, and Netflix? I wonder what the actual percentage of "Needed to pass a whiteboard-based Q&A to get a salaried position" is.
From my viewpoint, having never run in to them, they seem like something that was much more popular in the past, but now rarely used or only used at the aforementioned big six companies.