This. Something has definitely changed in the last ~10 to 20 years since the end of the dotcom era of interviewing in the tech industry. Before it was as simple as reading the AUTHORS file in an open-source project like Linux to vouch for a programmer applying to somewhere like Red Hat or Mozilla. But now we are expecting them to write a proof of quicksort's worst-case runtime complexity or to explain the Diffie-Helman public key exchange mathematically on a whiteboard to "see how you think" and "prove programmer ability" which is unnecessarily academic and they either don't use it directly or search on Google for it anyway.

That's just the onsite interviews, pre-interviews are riddled with Leetcode, Hackerrank and Codility tests which can be cheated or the solution can be found on Google. What a shame that these flawed tests still exist.