(Original commenter here) our company has been victim of overemployment with 2 employees (the worst offender found us via Who's Hiring on HN - he had 3 full-time W-2 jobs).
Having been fooled by 2 "overemployed" people (on a team of 20), these fake candidates are distinct in that they're almost always have an unexplained heavy accent yet they say they're born and raised in the US. They also often have Zoom backgrounds that are just... odd (the room will often look like it has shelving and boxes or whatever that don't look like something you would see in the US).
It's difficult because no single data point is enough to prove they're fake, but when you add all the warning signs together, it's pretty obvious.
In my experience, /r/overemployed people are a lot better at blending in with regular candidates.
Re: overemployment, the best counter-offense I've found is to require LinkedIn profiles and to require background checks that include employment verification. Most "overemployed" people are smart enough to not have a LinkedIn profile. This has a side effect of excluding applicants without a LinkedIn, but it's a tradeoff.
