First of all, as a boss, I would never hire someone from starfighters without an additional interview. Too many ways for one(s) to game the system. The current interview process may have faults, but it works out OK for the vast majority of the field. Are Ptacek & co trying to fix a problem that's simply not there?
As a software engineer, why would I even consider wasting my time with starfighters.io when I can simply go do as many traditional interviews as I want, with the top 10 companies in my field (that are also not using starfighters.io), get multiple job offers that I can use for leverage/negotiation, without having middlemen parasitize off of me. And this is exactly what starfighters.io is, a middleman. Historically, middlemen have been tolerated (yet always seen as parasites) whenever they ABSOLUTELY HAD to be there.
Ptacek's background is in computer security (Matasano). Rumor has it that whatever success they had came from consulting (penetration testing). The single product that they released that I am aware of, a firewall rule manager, didn't seem to go anywhere. One has to wonder what he's doing with starfighters.io.