We’re not talking unconscious bias silliness here. We’re talking about literal fraud/misrepresentation and needing verification that someone is who they claim to be. Using our eyebulbs isn’t inherently problematic.
On the topic of fraud prevention, the interviewer could simply ask the interviewee to be on camera for literally 5 seconds, then feel free to turn off video.
Again, this is based on an Upwork profile that already had a picture, so if discrimination was going to happen, it would be before the video interview stage anyway. This is just about a verification step, and in a platform like Upwork, refusing to be on camera for LITERALLY 5 seconds probably SHOULD be considered a big red flag.
The A/B studies are also used to prove discrimination that people usually won't admit to, not only to reveal unconscious bias.