To put some hard numbers to this: further down this thread, there's a post about how "any engineer" could answer a question the poster thinks is too easy. I looked up the question in our back end and, in fact, barely a third of people who take our quiz get it right (the correct answer isn't even the most common one!).

That's maybe a little unfair (plenty of people who aren't engineers take our quiz out of curiosity), but the basic point here - that companies are frustrated because they keep getting fizzbuzz-incapable applicants - is more-or-less accurate. That has been (and continues to be) a big part of our offering on the other side of our platform: in the same way that we can provide data about company behavior to engineers, we can provide independent verification of an applicant's skills to companies.