1) They were useless friction. As a candidate I could apply directly to the companies I was interested in, and take a phone screen and then on-site. With Triplebyte I had to take their much more time consuming process and get to the same point of either another phone screen or on-site. They added absolutely no benefit to me as a job seeker. Especially during the hiring heydays of 2019-2022 why would I need to use Triplebyte when I can get access to the recruiters myself?
If applying through Triplebyte offered some sort of benefit, like an easier on-site or straight to team match because the candidate had been vetted by Triplebyte, then that would be useful. Instead it was more interviews just to get to the same onsite that you could get to by passing a phone screen, so it was useless.
2) Triplebyte betrayed user privacy by posting their names etc on a new service that the users didn’t explicitly subscribe to. And it took a while for the CEO to acknowledge that and backtrack. That was the deathknell for Triplebyte for me as a candidate.