My impression is that they are still around, but they failed to deliver the "recruiting revolution" and I think the reasons are:

- The screening had a lot of false negatives. "I got rejected by Triplebyte, but got a FAANG offer" is quite common.

- Most companies used Triplebyte not as an interview replacement, but as an additional screening process, which means that as a candidate, you don't have any real incentive to use them.

The only real use case I heard recently about Triplebyte is to send candidate who normally you wouldn't even screen, so if they pass Triplebyte process, you know that you should consider the candidate, but if they fail is fine because you would have passed them anyways