They submitted a deep fake photo and never did a call.
To prevent a repeat, KnowBe4 is advising its peers in the industry to consider interviewing prospective employees on a video call to ensure they’re real
They didn't do one in this case, but I have heard stories of these sorts of malicious actors paying people stateside or elsewhere to take the video interviews. I've had to do ID checks on video in recent-ish interviews.
This is what would freak me out about work-from-home. If you can do your job from your living room, someone can probably also do it from China (and for a lot less money).