It's good to see this problem getting attention. Hackerrank et al are just leetcode with a HR system integration. They're optimised entirely for the business, not the candidate. It misses the point that there is a human aspect to this, too, and not everything should be fully automated.

It has happened more times than I'd care to admit that somebody has passed an interview that I've run following company guidelines (always some algorithm puzzle on a whiteboard) and they've been terrible at the job. It sucks for everybody, the new hire and their team, too. Other times I've been on the fence about somebody in an interview and they turn out to be amazing.

One thing that worries me is that I see "projects" as a test option with this. It's just as much of a problem where companies give candidates projects saying that it should only take a few hours when, in reality, it could take days. That's time that not everybody has on top of a full time job.