So the reason we don't do a quiz (I assume that's what you're referring to) is just that GPT makes it way too easy to cheat. GPT would've gotten almost the entirety of the old Triplebyte quiz right.

I have thought about having one available just for nerd-sniping growth-hack purposes, for the exact reason you say, but using it as a filter feels like it's just going to select for what is now very easy cheating. (Not that cheating on the TB quiz was that difficult, but it was nonzero effort.)

Instead of a quiz, you could do a puzzle / clue hunt.

That is a rather wild idea, there could be a single service that doesn't care if one is an employer or an employee.