I totally agree that asking people who created/maintain/make significant contributions to open source projects is a waste of time.
However, for hiring people who don't have a public body of work to point to - it remains pretty effective. (I am not affiliated with hackerrank/hackerearth/codility - just been on the hiring side for the last many years)
Also, in my current org - we've been able to trust people lacking the "expected" graduate degrees - solely because they were able to prove their acumen in the interview by solving algo-data-structure problems. (Of course, we have to be creative here - and avoid like the plague the same bunch of questions which are present all over the web)
However, for hiring people who don't have a public body of work to point to - it remains pretty effective. (I am not affiliated with hackerrank/hackerearth/codility - just been on the hiring side for the last many years)
Also, in my current org - we've been able to trust people lacking the "expected" graduate degrees - solely because they were able to prove their acumen in the interview by solving algo-data-structure problems. (Of course, we have to be creative here - and avoid like the plague the same bunch of questions which are present all over the web)