I imagine it's like the HomeBrew situation every day except 10 times worse because you recommended the candidate and the interviewer is your client. And unfortunately it's hard to make a business of telling your client they're doing it wrong.

This is all compounded by the fact that the devs who benefited most from their service were not Christopher Hemsworth looking Phd, ex-googlers who could get an interview with a phone call. Then come in with so much positive bias that as long as they didn't poo themselves during the interview they'd get hired. It was for people who were extremely skilled, but lacked the right pedigree or interviewing skills to be able to get the jobs they were very qualified for.

Curious to see what the real answer is.