I’m genuinely confused by this comment and any downvotes. No candidate is doing unpaid work for us or for this service (ie. building out their platform). It's a way to validate a skillset, pure and simple, and that's how this platform makes its money. The output from a candidate has no business value aside from this.
I can understand distaste about having a time imbalance (ie. a candidate is not investing the same # of ours as our staff), but like I said, this is a one and done thing and can be used w/ a way to cut down time working with any other companies using the platform.
For us it means going directly to the final rounds, whether they took it at our suggestion, for another company, or just did it for themselves. If they do it for us and they don't end up with an offer, they are not left empty-handed from the process.
In sum, it moves toward some sort of accreditation system, that’s the reason I mentioned it. It's a shame my comment is at the bottom of the pile as I too would love a future where the only time spent interviewing is just a couple hours getting to know my future teammates, and I truly feel platforms like this may eventually get us there.
All the same I'd appreciate feedback on why they're disliked. I've seen them mentioned in other HN threads without any vitriol.